Using standard deviation, the probability that the service technician will have to work overtime to fix the machine today is 0.5.
What does standard deviation mean?The degree of variance or dispersion in a set of data values is measured by standard deviation. It gauges how far the data values depart from the data set's mean (average).
The mean of the data set is first determined, then the standard deviation. The difference between each data point and the mean is then squared for each data point. After dividing the total number of data points by the sum of these squared differences, minus one, the standard deviation is calculated by taking the square root of this result.
a. The expected number of emails that are tracked can be found by multiplying the total number of emails by the probability that an email is tracked:
Expected number of tracked emails = 50 x 0.4 = 20
Therefore, we can expect that 20 out of 50 received emails will be tracked.
b. To find the variance and standard deviation for the number of tracked emails, we can use the formula:
Variance = np(1-p)
Standard deviation = sqrt(np(1-p))
where n is the number of trials (in this case, 50) and p is the probability of success (0.4).
Variance = 50 x 0.4 x (1 - 0.4) = 12
Standard deviation = sqrt(50 x 0.4 x (1 - 0.4)) ≈ 3.46
Therefore, the variance for the number of tracked emails is 12 and the standard deviation is approximately 3.46.
c. The probability distribution for the duration of a service call is:
Duration (hours) Probability
1 0.25
2 0.25
3 0.25
4 0.25
d. The probability that a service call will take three hours is 0.25, as shown in the probability distribution table.
e. To find the probability that the service technician will have to work overtime, we need to calculate the probability that a service call will take longer than two hours, since the technicians usually get off at 5:00 P.M. and it is currently 3:00 P.M.
The probability that a service call will take longer than two hours is:
P(call takes 3 hours or 4 hours) = P(call takes 3 hours) + P(call takes 4 hours) = 0.25 + 0.25 = 0.5
Therefore, the probability that the service technician will have to work overtime to fix the machine today is 0.5.
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The Browns are moving across the country. Mr. Brown leaves 5 hours before Mrs. Brown. If he averages 50mph and she averages 90mph , how many hours will it take Mrs. Brown to catch up to Mr. Brown?
It takes Mrs. Brown 6 hours and 15 minutes to catch up to Mr. Brown.
What does average speed refer to?
The entire distance travelled by the object in a specific amount of time is its average speed.
What is a mile?
A common unit of measurement is the mile. It is typically used to describe the length of rivers, highways, and distances between cities. The unit mile is represented by the letter "mi."
Mr. Brown departs at 50 mph five hours early, giving him a 250mile head start.
So:
50n+250=90n
40n=250
n=6.25 hours after Mrs. Brown leaves before she overtakes Mr. Brown.
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A grocery store bought milk for $2.90 per half gallon and stored it in two refrigerators. During the night, one refrigerator malfunctioned and ruined 14 half gallons. If the remaining milk is sold for $3.94 per half gallon, how many half gallons did the store buy if they made a profit of $46.76 ?
If the remaining milk is sold for $3.94 per half gallon, then the store initially bought 26 half gallons of milk for the profit of $46.76
What is meant by profit?
Profit is the term used to describe the financial gain experienced when the revenue from a company activity outpaces the costs, costs, and taxes incurred to support the activity in question.
Profit is the amount of money you have after paying for business expenses. Gross profit, operating profit, and net profit are the three basic categories of profit.
If the store bought x half gallons of milk at $2.90 per half gallon, the total cost of the milk would be:
total cost = 2.90x
Since the store stored the milk in two refrigerators, there were initially x/2 half gallons in each refrigerator.
Unfortunately, 14 half gallons were ruined, so the number of half gallons of milk remaining for sale is:
x - 14
The store then sells the remaining milk for $3.94 per half gallon, so the total revenue from the sale is:
total revenue = 3.94(x - 14)
The profit the store made is the difference between the total revenue and the total cost:
profit = total revenue - total cost
We know that the store made a profit of $46.76, so we can set up an equation:
46.76 = 3.94(x - 14) - 2.90x
Simplifying and solving for x:
46.76 = 3.94x - 55.16
102.92 = 3.94x
x = 26
So the store initially bought 26 half gallons of milk.
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The probability that a randomly selected person has high blood pressure (the event H) is P(H) = 0.3 and the probability that a randomly selected person is a runner (the event R) is P(R) = 0.4. The probability that a randomly selected person has high blood pressure and is a runner is 0.2. Select the false statement. Can you explain in detail how you would go about figuring this one out?
a) P(H ∩ Rc) = 0.1
b) P(R ∪ H) = 0.5
c) H and R are not mutually exclusive.
d) H and R are independent events.
e) P(Rc ∪ Hc) = 0.8
f) None of the above.
With probability that person has high blood pressure = 0.3 and the probability that person is a runner = 0.4, they are not independent events. So, Correct option is D .
Independence between two events is defined as follows, if two events A and B are independent, then the occurrence of one event (A) has no effect on the probability of occurrence of the other event (B). This can be mathematically represented as:
P(A ∩ B) = P(A) * P(B)
where P(A ∩ B) is the probability of both events A and B happening at the same time.
In this question, we are given the probabilities of two events: H (high blood pressure) and R (being a runner). The probability of H is 0.3 and the probability of R is 0.4. We are also given that the probability of H and R happening at the same time is 0.2.
Now, to check if H and R are independent, we need to see if the equation
P(H ∩ R) = P(H) * P(R)
holds true.
Plugging in the given values, we get:
0.2 = 0.3 * 0.4
This equation is false, so we can conclude that H and R are not independent events. This means that the occurrence of one event affects the probability of occurrence of the other event.
Option d) states that H and R are independent events, which we have just shown to be false.
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Hi. I have no idea what I’m doing so please someone that is experienced explain how and what to do here. And ofc answer the question. I will give you brainliest and report you to the head of Brainly saying that you are the best ever. Answer this question:
Based off the picture,
1. What is the absolute deviation? Round to the nearest tenth.
2. What is the median of the data?
3. What are the first and third quartiles of the data?
4. The standard deviation of the ages of class members is 14.8. Find the range of ages that are within one standard deviation of the mean age.
PLEASE HELP ME!!!!
Answer:
1. To round to the nearest tenth, we'll need to look at the digit to the right of the tenths place, the hundredths place. Since there's a three in the hundredths place, we will round down to 4.9. The mean absolute deviation of these eight values rounded to the nearest tenth is 4.9.
2. 1
Order the numbers in the data set and find the median.
2
Subtract the median from each number in the data set.
3
Take the absolute value of each difference.
4
Add up all of the positive differences.
5
Divide this sum by the number of data points in the set.
3.The lower quartile, or first quartile (Q1), is the value under which 25% of data points are found when they are arranged in increasing order. The upper quartile, or third quartile (Q3), is the value under which 75% of data points are found when arranged in increasing order.
4.
Step-by-step explanation:
Which description best explains the domain of (g circle f) (x)?
the elements in the domain of f(x) for which g(f(x)) is defined
the elements in the domain of f(x) for which g(f(x)) is not zero
the elements in the domain of g(x) for which g(f(x)) is defined
the elements in the domain of g(x) for which g(f(x)) is not zero
The correct description that best explains the domain of (g o f) (x) is: The elements in the domain of f(x) for which g(f(x)) is defined.
How to determine the domain of the fucntionFrom the question, we have the following parameters that can be used in our computation:
(g o f) (x)
The expression (g o f)(x) is a composite function
The domain of (g o f)(x) is the set of all possible inputs x for which the composition (g o f)(x) is defined.
For the composition (g o f)(x) to be defined, it is necessary that the input x belongs to the domain of f(x), and the output of f(x) belongs to the domain of g(x).
Hence, the domain of (g o f)(x) consists of all the elements in the domain of f(x) for which g(f(x)) is defined
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Unit 1 Introduction
6 Dahlia's teacher asked her to decompose
the number 6,107. How can Dahlia write
this number in expanded form?
Answers:
Ethan is 1.85 meters tall. At 10 a.m., he measures the length of a tree's shadow to be 28.45 meters. He stands 24.3 meters away from the tree, so that the tip of his shadow meets the tip of the tree's shadow. Find the height of the tree to the nearest hundredth of a meter.
The height of the tree to the nearest hundredth of a meter will be 6.40 meters.
What is trigonometry?Trigonometry is the branch of mathematics which set up a relationship between the sides and angles of right-angle triangles.
Let h be the height of the tree in meters. Then, based on the similar triangles formed by Ethan, his shadow, the tree, and its shadow, we have:
h / x = Ethan's height/distance to Ethan's feet from the tree
and
h / (x + 28.45) = Ethan's height/distance to Ethan's feet from the tip of the shadows
where x is the length of Ethan's shadow in meters. We can solve for x using the first equation as follows:
x = (Ethan's height/distance to Ethan's feet from the tree) * h
Substituting the given values, we get:
x = (1.85 / 24.3) x h = 0.076 x h
We can now substitute this value of x into the second equation and solve for h:
h / (0.076 x h + 28.45) = 1.85 / 24.3
Multiplying both sides by 0.076h + 28.45, we get:
h = (1.85 / 24.3) x (0.076h + 28.45)
Expanding the right side and simplifying, we get:
h = 0.070 x h + 5.95
Subtracting 0.070h from both sides, we get:
0.930h = 5.95
Dividing both sides by 0.930, we get:
h = 6.40 meters (rounded to the nearest hundredth)
Therefore, the height of the tree is approximately 6.40 meters.
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Which is better: using a bank teller or an ATM? Defend your selection using data associated with ATM information provided in this lesson.
ATMs offer a convenient and fast way for people to perform financial transactions, such as withdrawing cash, depositing checks, and transferring funds.
Advantages of using ATMs:Convenience: ATMs are available 24/7, making it easy to access your money and perform transactions outside of normal business hours.
Speed: ATMs are typically faster than bank tellers since you don't have to wait in line and can complete transactions quickly.
Privacy: ATMs offer a level of privacy that bank tellers may not, especially if you need to perform sensitive transactions like withdrawing large amounts of cash.
Disadvantages of using ATMs:Fees: Some ATMs charge fees for using their services, especially if you are not a customer of that particular bank.
Limited services: While ATMs offer many basic banking services, they may not be able to perform more complex transactions that require the assistance of a bank teller.
Technical issues: ATMs can sometimes experience technical issues, such as running out of cash or malfunctioning, which can be frustrating for users.
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Information provided in the lesson is not in the question so i gave a general view
a graphing calculator is recommended. find the taylor polynomial t3(x) for the function f centered at the number a. f(x)
Third-degree Taylor polynomial for f(x) = e centered at a = 1 using a graphing calculator estimate the value of eˣ near x = 1.
A polynomial is an expression consisting of variables and coefficients, which involves only the operations of addition, subtraction, multiplication, and non-negative integer exponents.
Now, let's focus on the Taylor polynomial. The Taylor polynomial of degree n for a function f(x) centered at a is given by the formula:
[tex]Tn(x) = f(a) + f'(a)(x - a) + f''(a)(x - a)^{2/2!} + f'''(a)(x - a)^{3/3!} + ... + f^{n}(a)(x - a)^{n/n!}[/tex]
In this formula, f'(a), f''(a), f'''(a), and f^(n)(a) are the first, second, third, and nth derivatives of f(x), respectively, evaluated at a. The symbol n! denotes the factorial of n, which is the product of all positive integers from 1 to n.
In our case, we're given the function f(x) = e and a = 1. The first derivative of e^x is e^x, the second derivative is e^x, and the third derivative is also eˣ. Evaluating these derivatives at a = 1, we get:
f(1) = e¹ = e
f'(1) = e¹ = e
f''(1) = e¹ = e
f'''(1) = e¹ = e
Substituting these values into the formula for the Taylor polynomial, we get:
[tex]T3(x) = e + e(x - 1) + e(x - 1)^{2/2!} + e(x - 1)^{3/3!}[/tex]
Simplifying this expression, we get:
[tex]T3(x) = e + e(x - 1) + e(x - 1)^{2/2} + e(x - 1)^{3/6}[/tex]
This is the third-degree Taylor polynomial for f(x) = e centered at a = 1. It can be used to approximate the value of eˣ near x = 1.
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Complete Question:
A graphing calculator is recommended. Find the Taylor polynomial T3(x) for the function f centered at the number a. f(x) = e, a = 1.
which of the following is the warmest temperature?
5oF above zero, 6oF below zero, 10oF below zero 2oF above zero
Answer: 50 above zero
Step-by-step explanation:
In Problems 9 and 10 determine whether the given first-order differential equation is linear in the indicated dependent variable by matching it with the first differential equation given in (7).
9. (y^2 - 1)dx + x dy = 0; in y; in x
10. u dv + (v + uv - ue^u) du = 0; in v; in u
8. M(x,y) and N(x,y) are functions of x and y, not just y, so the given differential equation is not linear in y.
9. Both M(u,v) and N(u,v) are functions of u, so the given differential equation is linear in u.
8. To match the given differential equation with the first differential equation given in (7), we need to write the given equation in the form of M(x,y)dx + N(x,y)dy = 0. If the resulting M(x,y) and N(x,y) are both functions of y, then the differential equation is linear in y.
Rewriting (y² - 1)dx + xdy = 0 as xdy = (1 - y²)dx and dividing by x(1 - y²), we get (1/x)dy - [(y² - 1)/(x(1 - y²))]dx = 0.
Therefore, we have M(x,y) = (y² - 1)/(x(1 - y²)) and N(x,y) = 1/x. Both M(x,y) and N(x,y) are functions of x and y, not just y, so the given differential equation is not linear in y.
9. To match the given differential equation with the first differential equation given in (7), we need to write the given equation in the form of M(u,v)du + N(u,v)dv = 0. If the resulting M(u,v) and N(u,v) are both functions of u, then the differential equation is linear in u.
We can rewrite the given equation as u dv + (v + uv) du - [tex]ue^u[/tex] du = 0.
Therefore, we have M(u,v) = v + uv - [tex]ue^u[/tex] and N(u,v) = u. Both M(u,v) and N(u,v) are functions of u, so the given differential equation is linear in u.
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I need to find the length of JU, Triangle JTU is similar to JLK.
The measure of the side JU of the triangle will be 24 units.
Geometry is one of the oldest branches of mathematics, along with arithmetic. It is concerned with spatial properties such as figure distance, shape, size, and relative position.
Given that the two triangles ΔLKJ and ΔTUJ are similar. The sides LK 96 and the side JK = 64. The side JU = -4 + 4x and JT = 27.
From the similarity property, the length of the segment JU will be calculated as:-
LK / TU = JK / JU
96 / 36 = 64 / ( -4 + 4x )
96( -4 + 4x ) = 36 x 64
-384 + 384x = 2304
384x = 2688
x = 7
The value of JU will be,
JU = -4 + 4x
JU = -4 + 4 x 7
JU = -4 + 28
Ju = 24
Therefore, the length of JU will be 24 units.
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Question 5
10 pts
Which quadrant of a coordinate plane contains the point
(7,-8)
O Quadrant IV
O Quadrant III
O Quadrant I
O Quadrant II
Next
The point (7, -8) is located in the third quadrant (Quadrant III) of the coordinate plane, as the x-coordinate is positive and the y-coordinate is negative.
What is quadrant ?In a coordinate plane, a quadrant is one of the four regions that are formed by dividing the plane into four equal parts by the x-axis and y-axis. The x-axis and y-axis intersect at the origin (0, 0), and the four regions are labeled as Quadrant I, Quadrant II, Quadrant III, and Quadrant IV
Therefore, Each quadrant has its own characteristics and is used in different applications, such as plotting points, graphing functions, and solving problems in mathematics and science.
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Suppose the ratio of Lev's age to Mina's age is 1 : 2 and the ratio of Mina's age to Naomi's age is 3 : 4.
If the sum of all three ages is between 30 and 50, then how old is Mina?
Based on the given age ratio, Mina is 10 years old.
From the case, we know that the age ratio between these 3 people are:
L : M = 1 : 2
M : N = 3 : 4
L = 2M
N = 4/3 M
30 < L + M + N < 50
We can try to find Mina's age range as:
30 < 2M + M + 4/3 M < 50
30 < 13/3 M < 50
120 < 13M < 150
9 < M < 11
Please note that we round down the age range of Mina.
We take M = 10; then:
L = 2M = 2(10) = 20
N = 4/3 M = 4/3 (10) = 13
L + M + N = 20 + 10 + 13
L + M + N = 43 --> PROVEN!
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A man walks at 50km per hour.What distance would he cover in 2 and a half hours. pls due 40mins pls hurry 50points!
Answer:
Step-by-step explanation:
He can walk 125km in 2 and a half hours
Answer:
125km
Step-by-step explanation:
If he walks 50km per hour and he walks 2 hours it's 2 x 50km = 100km
if walks for another half hour the half of 50km is 25km so 100km + 25km = 125km
The average height of male basketball players is 79 inches with a standard deviation of 3.25 inches. We want to mass produce special caskets for the NBA that are long enough for all but the tallest 2% of male basketball players.
What is the inside length of the longer NBA caskets in inches (to 2 decimals)?
The inside length of the longer NBA caskets in inches is, 85.6745
What is standard deviation ?A statistical measure of the degree of variation or dispersion in a set of values is the standard deviation. It offers a way to measure how far apart the individual values in a data set are from the set's mean (average). The square root of the variance is used to calculate the standard deviation, which is denoted by the symbol (sigma).
We are given the distribution here as:
From standard normal tables, we have here:
P(Z < 2.0537) = 0.98
Therefore, P(Z > 2.0537) = 1 - 0.98 = 0.02
Therefore 2.0537 is the z score that would be used here. ( As we are given here that for tallest 2% of the male basketball players, the special caskets for the NBA would be too tall )
Therefore the longest length here is computed as:
= Mean + 2.0537xSD
= 79 + 2.0537x3.25
= 85.6745 inches is the required length here.
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Suppose that a customer is purchasing a car. He conducts an experiment in which he puts 10 gallons of gas in the car and drives it until it runs out of gas. He conducts this experiment 15 times on each car and records the number of miles driven.
Full data set
Car 1
248
230
204
227
243
285
285
157
280
251
163
318
273
316
272
Car 2
226
201
232
202
241
244
234
278
246
279
276
247
252
274
272
Describe each data set, that is determine the shape, center, and spread.
Sample mean for Car 1
x overbar equals
nothing
mi / 10 gal
(Type an integer or decimal rounded to one decimal place asneeded.)
Sample mean for Car 2
x overbar equals
nothing
mi / 10 gal
(Type an integer or decimal rounded to one decimal place asneeded.)
Median for Car 1
Mequals
nothing
mi / 10 gal
(Type an integer or decimal rounded to one decimal place asneeded.)
Median for Car 2
Mequals
nothing
mi / 10 gal
(Type an integer or decimal rounded to one decimal place asneeded.)
Range for Car 1
Requals
nothing
mi / 10 gal
(Type an integer or decimal rounded to one decimal place asneeded.)
Range for Car 2
Requals
nothing
mi / 10 gal
(Type an integer or decimal rounded to one decimal place asneeded.)
Sample standard deviation for Car 1
sequals
nothing
mi / 10 gal
(Type an integer or decimal rounded to one decimal place asneeded.)
Sample standard deviation for Car 2
sequals
nothing
mi / 10 gal
(Type an integer or decimal rounded to one decimal place asneeded.)
Which car would the customer buy and why?
A.
Car
1
,
because it has a lower mean gas mileage.
B.
Car
1
,
because it has a larger range of gas mileage.
C.
Car
2
,
because it has a lower sample standard deviation, hence more predictable gas mileage.
D.
There is very little difference between the two cars.
The car that would the customer buy is option (c) Car 2, because it has a lower sample standard deviation, hence more predictable gas mileage.
The standard deviation is a measure of how much the data deviates from the mean.
Looking at the data sets, we can see that Car 1 has a wider range of gas mileage, with a minimum of 157 miles and a maximum of 318 miles per 10 gallons of gas. In comparison, Car 2 has a narrower range, with a minimum of 201 miles and a maximum of 279 miles per 10 gallons of gas. The range is a measure of spread, and we can see that Car 1 has a larger spread.
To further analyze the spread, we can calculate the sample standard deviation for each data set. A higher standard deviation indicates more variability in the data. In this case, Car 1 has a sample standard deviation of 43.6 miles per 10 gallons of gas, while Car 2 has a sample standard deviation of 22.9 miles per 10 gallons of gas. This means that Car 1 has more variability in its gas mileage.
In terms of center, we can calculate the sample mean for each data set. The sample mean is a measure of the average gas mileage. Car 1 has a sample mean of 247.5 miles per 10 gallons of gas, while Car 2 has a sample mean of 249.7 miles per 10 gallons of gas. We can also calculate the median, which is the middle value of the data set. Car 1 has a median of 252.5 miles per 10 gallons of gas, while Car 2 has a median of 252.0 miles per 10 gallons of gas.
Based on these measures, we can see that there is very little difference between the two cars in terms of center. However, Car 2 has a lower sample standard deviation, indicating more predictable gas mileage. Therefore, the customer should choose Car 2 because it has more consistent gas mileage.
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Sandpiper Company has 15,000 shares of cumulative preferred 2% stock, $50 par and 50,000 shares of $5 par common stock. The following amounts were distributed as dividends:
20Y1 $37,500
20Y2 12,000
20Y3 45,000
Determine the dividends per share for preferred and common stock for each year.
The dividends per share for the preferred stock are $2.50, $0.80, and $3.00 for 20Y1, 20Y2, and 20Y3, respectively.
The dividends per share for the common stock are $0.75, $0.24, and $0.90 for 20Y1, 20Y2, and 20Y3, respectively.
How to determine the dividends per share for preferred and common stock for each year?To determine the dividends per share for preferred and common stock, we need to divide the total dividends by the number of shares outstanding for each type of stock.
For the preferred stock:
20Y1: $37,500 ÷ 15,000 shares = $2.50 per share
20Y2: $12,000 ÷ 15,000 shares = $0.80 per share
20Y3: $45,000 ÷ 15,000 shares = $3.00 per share
For the common stock:
20Y1: $37,500 ÷ 50,000 shares = $0.75 per share
20Y2: $12,000 ÷ 50,000 shares = $0.24 per share
20Y3: $45,000 ÷ 50,000 shares = $0.90 per share
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Determine whether the set of vectors is linearly independent or linearly dependent. In the case of linear dependence, write down a nontrivial linear combination of the vectors that equals the zero vector.(b) V1= | 2 | ,V2=| 01,V3-12,v4-11 Vo= V4= 13 113 422 301 123
A nontrivial linear combination of the vectors that equals the zero vector, we can conclude that the set is linearly dependent.
Linear Dependent VectorsThe set of vectors is linearly dependent because V3 can be written as a linear combination of V1, V2, and V4:
V3 = 2V1 - 3V2 + V4
To see this, we can write out each component of the vectors:
V1 = | 2 | , V2 = | 0 | , V3 = | -1 | , V4 = | 1 |
| 1 | | 1 | | 2 | | 3 |
Then we can plug in the values and see that the equation holds:
2V1 - 3V2 + V4 = 2| 2 | - 3| 0 | + | 1 | = | 4 | - | 0 | + | 1 | = | 5 |
| 1 | | 1 | | 3 | | 1 | | 1 | | 2 | | 3 | | 1 |
Since we have found a nontrivial linear combination of the vectors that equals the zero vector, we can conclude that the set is linearly dependent.
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The average cost of college for one year is $26,489 with a standard deviation of $3204. If 36 colleges are selected at random, find the following probabilities. Record your answers as a percentage, rounded to the nearest hundredth.
1. Probability the sample mean cost for the 36 schools is less than $25,000
2. Probability that the sample mean cost for the 36 schools is more than $26,000
3. Probability that the sample mean cost for the 36 schools is between $25,575 and $26,500
the probability that the sample mean cost for the 36 schools is between $25,575 and $26,500 is 54.14%.
What is percentage?Percentage is a way of expressing a number as a fraction of 100. The symbol for percentage is "%". For example, if you have 75%, it means 75 out of 100 or 0.75 as a decimal.
Given by the question.
We can solve these problems by using the central limit theorem and the formula for the standard error of the mean.
The standard error of the mean is:
SE = σ/√n
where σ is the population standard deviation, n is the sample size, and √ is the square root.
Using the given values, we have:
SE = 3204/√36 = 534
To find the probability that the sample mean cost for the 36 schools is less than $25,000, we need to calculate the z-score and then use a z-table to find the probability.
z = (25000 - 26489) / 534 = -2.79
Using a standard normal distribution table or calculator, we find that the probability of a z-score less than -2.79 is 0.0026 or 0.26%.
Therefore, the probability that the sample mean cost for the 36 schools is less than $25,000 is 0.26%.
To find the probability that the sample mean cost for the 36 schools is more than $26,000, we need to calculate the z-score and then use a z-table to find the probability.
z = (26000 - 26489) / 534 = -0.91
Using a standard normal distribution table or calculator, we find that the probability of a z-score more than -0.91 is 0.8186 or 81.86%.
Therefore, the probability that the sample mean cost for the 36 schools is more than $26,000 is 81.86%.
To find the probability that the sample mean cost for the 36 schools is between $25,575 and $26,500, we need to calculate the z-scores for both values and then use a z-table to find the probabilities.
z1 = (25575 - 26489) / 534 = -1.73
z2 = (26500 - 26489) / 534 = 0.21
Using a standard normal distribution table or calculator, we find that the probability of a z-score less than -1.73 is 0.0418 and the probability of a z-score less than 0.21 is 0.5832.
Therefore, the probability that the sample mean cost for the 36 schools is between $25,575 and $26,500 is the difference between these probabilities:
0.5832 - 0.0418 = 0.5414
Multiplying by 100, we get a probability of 54.14%.
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Inga is solving 2x2 + 12x – 3 = 0. Which steps could she use to solve the quadratic equation? Select three options. 2(x2 + 6x + 9) = 3 + 18 2(x2 + 6x) = –3 2(x2 + 6x) = 3 x + 3 = Plus or minus StartRoot StartFraction 21 Over 2 EndFraction EndRoot 2(x2 + 6x + 9) = –3 + 9
The steps that she could use to solve the quadratic equation is determined as 2(x² + 6x + 9) = 18 + 3.
What is Equation?Equations are mathematical statements with two algebraic expressions flanking the equals (=) sign on either side.
It demonstrates the equality of the relationship between the expressions printed on the left and right sides. LHS = RHS is a common mathematical formula.
Coefficients, variables, operators, constants, terms, expressions, and the equal to sign are some of the components of an equation. The "=" sign and terms on both sides must always be present when writing an equation.
Given:
2x² + 12x - 3 = 0
2x² + 12x = 3
divide through by 2
x² + 6x = ³/₂
Take half of coefficient of x, square it and add it both sides of the equation
(x + 3)² = ³/₂ + 3²
x² + 6x + 9 = 9 + ³/₂
2(x² + 6x + 9) = 18 + 3
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please help its due tommorw the options are negative, postive or same
Opposite numbers 5 and -5 are opposite because they are an equal distance from zero.
Absolute value, like |-5| = 5, means that the number is at five units of distance from zero.
How to obtain the opposite of a number?The opposite of a number is obtained exchanging just the signal of the number.
The opposite of a number x is then given as follows:
-x.
As the number and it's opposite is the same distance from zero, they have the same absolute value.
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The ill fated ship Titanic weighed 46,000 US tons. How many kilograms did it weigh? not metric tons
Amount of butter
What was the difference between the highest guess and the lowest guess?
Write your answer as a fraction, mixed number, or whole number.
The difference between the highest and the lowest guess, on the whole number, is 120.
What is subtraction?Subtraction is a mathematical operation. Which is used to remove terms or objects in the expression.
Given:
A table that shows the amount of butter.
Amount of butter
120
130
150
240
From the table;
the highest guess is 240.
And the lowest guess is 120.
So, the difference between the highest and the lowest guess is,
= 240 - 120
= 120.
And here, 120 is a whole number.
Therefore, the required value is 120.
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Which is the best type of graph to show the number of students who earned extra credit each day this week?
A bar graph or a column chart would be the best type of graph to show the number of students who earned extra credit each day this week.
What is a Bar chart?The visual display of data (often grouped) in the shape of vertical or horizontal rectangular bars, with the length of the bars corresponding to the measure of the data, is called a bar graph. Bar charts are another name for them.
The bar graph or column chart will allow you to easily compare the number of students who earned extra credit on each day of the week and see any trends or patterns that may exist.
The vertical bars on the graph represent the number of students who earned extra credit, and the horizontal axis shows the days of the week.
You could also consider using a line graph to show the trend in the number of students earning extra credit over the course of the week,
but this would not be as effective in comparing the number of students who earned extra credit each day.
Therefore, the bar graph or column chart is the required graph.
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generally, the more someone exercises the less they will weigh (while also maintaining a proper diet). john has started exercising and eating healthy and has recorded his weight each week. using a regression model, how much would you expect john to weigh at the end of week 8 if he continues with his new routine? (round your answer to the nearest tenth.)
We would expect John to weigh approximately 199.8 pounds at the end of week 8 if he continues to burn 6100 calories per week and maintains a proper diet.
Finding the best linear relationship between the independent and dependent variables is the aim of linear regression. To put it another way, it seeks out the line (or plane, or hyperplane in higher dimensions) that best fits the data. The dependent variable's future values for new values of the independent variable can then be predicted using this line.
We may build a linear regression model using the provided data, with activity (in calories) serving as the independent variable and weight (in pounds) serving as the dependent variable. Using this model, we can then forecast John's weight at the conclusion of week eight depending on the number of calories he burned in that week.
Using a spreadsheet or statistical software, we can calculate the regression equation:
Weight = -0.0049 x Exercise + 229.85
We can plug in the exercise value for week 8 (6100 calories) and solve for weight:
Weight = -0.0049 x 6100 + 229.85
Weight ≈ 199.8 pounds
Therefore, we would expect John to weigh approximately 199.8 pounds at the end of week 8 if he continues to burn 6100 calories per week and maintains a proper diet.
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the midterm and final exam grades for a statistics course are provided in the data set below. jaymes, a student in the class, scored 86 on both exams. treat the given data sets as samples. based on the z-scores calculated above, which of jaymes's grades is more unusual, the midterm grade or the final exam grade? select the correct answer below: A. the absolute value of the z-score for the final exam grade is greater than for the midterm grade, so the final exam grade is more unusual. B. the absolute value of the z-score for the midterm exam grade is less than for the final grade, so the midterm grade is more unusual. C. the absolute value of the z-score for the midterm exam grade is greater than for the final grade, so the midterm grade is more unusual. D. the absolute value of the z-score for the final exam grade is less than for the midterm grade, so the final exam grade is more unusual.
The answer is (C) the absolute value of the z-score for the midterm exam grade is greater than for the final grade, so the midterm grade is more unusual.
To calculate the z-scores for the midterm and final exam grades, we first need to calculate the mean and standard deviation for each data set.
For the midterm exam grades:
mean = (80 + 78 + 85 + 82 + 79 + 79 + 78 + 86 + 80 + 84) / 10 = 81.1
standard deviation = sqrt([ (80-81.1)^2 + (78-81.1)^2 + ... + (84-81.1)^2 ] / 9) = 2.336
For the final exam grades:
mean = (81 + 88 + 68 + 69 + 69 + 81 + 82 + 86 + 76 + 71) / 10 = 77.1
standard deviation = sqrt([ (81-77.1)^2 + (88-77.1)^2 + ... + (71-77.1)^2 ] / 9) = 7.042
Now, we can calculate the z-scores for Jaymes's grade of 86 on each exam:
z-score for midterm grade = (86 - 81.1) / 2.336 = 2.094
z-score for final exam grade = (86 - 77.1) / 7.042 = 1.259
To determine which grade is more unusual, we need to compare the absolute values of the z-scores. Since the absolute value of the z-score for the midterm grade is greater than for the final exam grade (|2.094| > |1.259|), we can conclude that the midterm grade is more unusual for Jaymes. Therefore, the answer is (C).
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_____The given question is incomplete, the complete question is given below:
The midterm and final exam grades for a statistics course are provided in the data set below. Jaymes, a student in the class, scored 86 on both exams. Treat the given data sets as samples. Jaymes's wants to know which grade is more unusual, the midterm grade or the final exam grade. Use Use a TI-83, TI-83 Plus, or TI-84 calculator to calculate the z-scores corresponding to each grade. Round your answer to three decimal places.
Midterm 80, 78, 85, 82, 79, 79, 78, 86, 80, 84,
final 81, 88, 68, 69, 69, 81, 82, 86, 76, 71
If 50l of liquid has a mass of 100kg, what is the density of the liquid in g/cm3? Note:1l = 1000cm3
The density of the liquid is 2g/cm³
What is density?The density of a substance is the relationship between the mass of the substance and how much space it takes up (volume). The mass of atoms, their size, and how they are arranged determine the density of a substance. Density equals the mass of the substance divided by its volume; D = m/v.
Where D is the density
m is the mass and
v is the volume
mass = 100kg = 100000 g( 1kg = 1000g)
50l = 50 × 1000 = 50000cm³
density = 100000/50000
= 2g/cm³
therefore the density of the liquid is 2 g/cm³
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Find the volume of the solid obtained by rotating the region bounded by the given curves about the specified line. Sketch the region, the solid, and a typical disk or washer.
y=6−x^2, y=2; about the x-axis
The solid is a cylinder with a typical disk or washer. It is obtained by rotating the region bounded by[tex]y = 6 - x^2[/tex]and y = 2 about the x-axis. The volume is 48π.
The region to be rotated is bounded by the equations [tex]y = 6 - x^2[/tex] and y = 2. The region is bounded horizontally by x = 0 and x = 2 and vertically by y = 2 and [tex]y = 6 - x^2.[/tex] To find the volume of the solid we can use the formula V = ∫2π0∫2y0rdrdθ. The integral inside is the area of a disk with radius r and the integral outside is the circumference of a circle with radius r. We substitute [tex]y = 6 - x^2[/tex] into the integral, giving us [tex]V = ∫2π0∫2(6 - x^2)0rdrdθ[/tex]. By solving the integral we get V = 48π.
y = 2
x² = 6×4 = 24
V = ∫2π0∫2y0rdrdθ
V = 48π
The solid is a cylinder with a typical disk or washer and is obtained by rotating the region bounded by [tex]y = 6 - x^2[/tex] and y = 2 about the x-axis.
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let r be a region in quadrant i with centroid (3,5) and area 12 unit square. find the volume of the solid formed when this region is rotated around the y-axis.
The volume of the solid formed when this region is rotated around the y-axis is V = ∫[1,9] π(8 - y/2)² dy cubic units
Volume is a measure of the amount of three-dimensional space that a solid object occupies.
To find the volume of the solid formed when the region is rotated around the y-axis, we need to use the disk method. This involves slicing the solid into thin disks perpendicular to the y-axis and adding up the volumes of all the disks.
Each disk will have a thickness of dy and a radius of x, which can be expressed in terms of y. We can find the radius of each disk by considering the distance between the y-axis and the edge of the region. Since the region is in quadrant i, we know that the edge of the region is at x = 0 (the y-axis) and x = 6 (the right boundary of the region). Therefore, the radius of each disk is given by x = 6 - (y - 5)/2, or equivalently, x = 8 - y/2.
The area of each disk is given by the formula for the area of a circle, A = πr². Substituting our expression for x into this formula, we get
=> A = π(8 - y/2)².
To find the volume of the solid, we need to integrate the area of each disk over the range of y values that covers the region. Since the region has centroid (3,5) and area 12 square units, we know that the region must extend from y = 1 to y = 9. Therefore, the volume of the solid is given by the integral:
V = ∫[1,9] π(8 - y/2)² dy cubic units
Evaluating this integral will give us the volume of the solid formed by rotating the region around the y-axis.
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