Answer: The variance of a sample of size n can be calculated using the formula:
variance = (sum of squared deviations from the mean) / (n - 1)
where the deviation from the mean is the difference between each individual value and the sample mean, and the sum of squared deviations is the sum of the squares of these differences.
However, we don't have the individual weights or the sample mean, only the standard deviation. We can use a related formula that expresses the standard deviation in terms of the variance:
standard deviation = sqrt(variance)
Solving for variance, we get:
variance = (standard deviation)^2
Plugging in the given standard deviation of 12.3194 kg, we get:
variance = (12.3194 kg)^2 = 151.8992 kg^2
Therefore, the variance of the weights of the 10 subjects is 151.8992 kg^2.
Step-by-step explanation:
17 feet by 20 feet. 3 foot wide sidewalk around the garden. How many feet of lumber is needed for the perimeter of the walk?
In order to create a 3 foot broad sidewalk around the garden, 98 feet of lumber will be needed.
what is perimeter ?The word "perimeter" in mathematics refers to the distance that surrounds the perimeter of a two-dimensional shape, such as a circle, square, or rectangle. It represents the total length of the shape's edges. For instance, you can calculate a rectangle's perimeter by multiplying the lengths of each of its four sides: P = 2l + 2w, where P stands for the perimeter, l for the rectangle's length, and w for its breadth.
given
We must multiply each dimension of the garden by the sidewalk's width to determine the overall length of the perimeter in order to determine the walk's perimeter.
The garden's revised measurements, including the 3-foot-wide sidewalk that surrounds it, are as follows:
Length = (17 + 2(3)) feet.
width = 20 + 2 (3) = 26 feet.
The sum of the four edges defines the walk's perimeter:
Width is equal to 98 feet (23 + 23 + 26 + 26).
In order to create a 3 foot broad sidewalk around the garden, 98 feet of lumber will be needed.
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f the random walk starts in the center, on average how many steps does it take to return to the center?
Total number of steps taken by an average man in a year while walking with 7192 steps a day is equals to 2,625,080 steps/year.
Number of steps taken by average man in a day is equals to 7192
Then the total number of steps he takes in a year is equals to,
Calculate it by multiplying the average number of steps per day by the number of days in a year.
There are different ways to define a year,
But assuming a regular calendar year of 365 days, the calculation would be,
Total number of days in a year = 365 days
Total number of steps in a year
= 7192 steps/day x 365 days/year
= 2,625,080 steps/year
Therefore, on average the man would walk about 2,625,080 steps in a year.
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The given question is incomplete, I answer the question in general according to my knowledge:
If a man walks with random steps and the average man takes 7192 steps a day about how many steps does the average man take in a year?
the difference between two numbers is six and there sum is ten. find the two numbers
Step 1: Let the two numbers be x and y
Step 2: Since we know the difference between the two numbers is 6, that means x = y + 6
Step 3: We also know the sum of the two numbers is 10, so x + y + 6 = 10
Step 4: Simplifying, we get 2y + 6 = 10
Step 5: Subtracting 6 from both sides, we get 2y = 4
Step 6: Dividing both sides by 2, we get y = 2
Step 7: Finally, we can use the first equation (x = y + 6) to solve for x, so x = 8
Therefore, the two numbers are 8 and 2.
a system of equations is shown below.
y=3x+5
x + y=-7
1. (Non-Isomorphic Trees) (a) Think of a by-hand method to give a list of all non-isomorphic trees on exactly (b) Use your results from (a) to give a list of all non-isomorphic trees on exactly six Be sure to explain in detail the method you came up with to acquire your five vertices. Display your results. vertices. Show you're results. lists in (a) and (b).
Method to list all non-isomorphic trees on n vertices is to add edges to a single vertex tree. Using A, B, C, D, E, we list 5 non-isomorphic trees on 6 vertices.
A by-hand method to give a list of all non-isomorphic trees on exactly n vertices is to start with a tree on n vertices and then generate all possible trees by adding edges between vertices that are not already connected.
For example, to find all non-isomorphic trees on 4 vertices, we can start with a single vertex and then add edges to form a tree with 2 vertices, then add edges to form a tree with 3 vertices, and finally add edges to form a tree with 4 vertices. We can then check each tree for isomorphism by comparing their adjacency matrices.
Using the method from (a), we can find all non-isomorphic trees on exactly six vertices by starting with a single vertex and adding edges until we have a tree on six vertices.
To ensure that we generate all possible trees, we can use the following five vertices: A, B, C, D, E. We can then generate all trees by adding edges between vertices that are not already connected, making sure to avoid creating cycles. After generating all trees, we can check for isomorphism by comparing their adjacency matrices.
The resulting list of non-isomorphic trees on six vertices, in alphabetical order, is shown. The tree 1 and tree 2 are the same. Also, trees 3, 4, and 5 are not isomorphic to each other or to trees 1 and 2.
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1. A rational number between √2 and √3 is
[tex]\sqrt{2} = 1.414[/tex]. [tex]\sqrt{x3} = 1.732[/tex]. So, a rational number between those two would be [tex]1.5 (\frac{3}{2} )[/tex].
What is an example of a rational number?A rational number is any fraction with a non-zero denominator. Examples for rational numbers comprise 1/2, 1/5, 3/4, as well as other values. The number "0" also qualifies as a rational number since there are various ways to express it, including 0/1, 0/2, 0/3, etcetera.
Simply put, what's a rational number?Any number that can be expressed as a fraction and where the divisor (the bottom number) and the numerator (the total score) are both integers is considered a rational number. In other words, p/q, where both p and q both are integers and q 0, can be used to represent a rational number.
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Suppose you are trying to estimate the average age of the entire CSU student population. You collect a sample of size n-163, and from your data you calculate x =20.1 s 1.8 round your answers to 3 decimal places) 1. The standard error of the mean for this data set is: 2. The approximate 95% margin of error is (Use the approximation method from the notes, in which the critical value is approximately 2.) 3. The approximate 95% CI for lage is
a) The standard error of mean for this data set is approximately 0.141.
b) The approximate 95% margin of error is approximately 0.282.
c) The approximate 95% confidence interval for the population mean age is 19.824 to 20.376.
a) The standard error of mean (SEM) is given by the formula: SEM = s / sqrt(n), where s is the sample standard deviation and n is the sample size. Plugging in the values given, we have:
SEM = 1.8 / sqrt(163) ≈ 0.141
So the standard error of the mean is approximately 0.141.
b) The approximate 95% margin of error (MOE) can be calculated using the formula: MOE ≈ 2 * SEM. Plugging in the SEM value from part 1, we get:
MOE ≈ 2 * 0.141 ≈ 0.282
So the approximate 95% margin of error is approximately 0.282.
c) The approximate 95% confidence interval (CI) for the population mean age can be calculated using the formula: CI = x ± (z*SEM), where x is the sample mean, z is the critical value from the standard normal distribution corresponding to the desired level of confidence (95% in this case), and SEM is the standard error of the mean. The critical value for 95% confidence is approximately 1.96. Plugging in the values, we get
CI = 20.1 ± (1.96 * 0.141) ≈ 19.824 to 20.376
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of the following people, who would be included in the survey conducted by the bureau of labor statistics?
The people who are included in the survey conducted by Bureau of Labor Statistics are (a) certain unpaid workers, (b) part-time workers and (c) workers on vacation, the correct option is (d).
The Bureau of Labor Statistics (BLS) is a unit of the US Department of Labor that is responsible for collecting, analyzing, and publishing data on labor market activity, working conditions, and price changes in the economy.
The Bureau of Labor Statistics (BLS) considers individuals to be employed if they meet any of the given criteria:
(i) Worked at least one hour as paid employees
(ii) Worked at least 15 hours as unpaid workers in a family-owned enterprise
(iii) Were temporarily absent from their regular jobs due to illness, vacation, strike, etc.
⇒ This means that certain unpaid workers, such as family members working in a family-owned business, would be considered employed by the BLS.
⇒ Part-time workers, who work less than 35 hours per week but are paid for their work, are also included in the employed category.
⇒ The Workers on vacation are considered employed by the BLS because they are temporarily absent from their job.
Therefore, all the options are correct , which is Option(d).
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The given question is incomplete, the complete question is
Who of the following are included in the Bureau of Labor Statistics "employed" category?
(a) certain unpaid workers
(b) part-time workers
(c) workers on vacation
(d) All of the above are correct.
Write a quadratic inequality represented by the graph.
Using the concept of parabola, the quadratic inequality represented by the graph can be written as:
y = x² -2x +2.
Define parabola?An equation of a curve that has a point on it that is equally spaced from a fixed point and a fixed line is referred to as a parabola.
The parabola's fixed point is referred to as the focus, and its fixed line is referred to as the directrix.
The general equation for a parabola is given as:
y = a(x-h) ² + k
Now here we have:
(x,y) = (2,5)
(h,k) = (1,1)
Putting these values in the equation,
5 = a (2-1) ² + 1
a = 5-1
=4
Substituting the values:
y = (x-1) + 1
y = x² -2x +2
Therefore, the quadratic inequality can be written as: y = x² -2x +2.
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why is it easier to add, subtract, multiply, or divide very large or very small numbers in scientific notation than standard
It is easier to add, subtract, multiply or divide very large or very small number in scientific notation because it reduces error, simplifies computation, and eases comparison.
The Scientific notation is defined as a system of writing numbers as a coefficient multiplied by a power of ten, where the coefficient is usually a number between 1 and 10.
Using scientific notation makes it easier to perform arithmetic operations on very large or very small numbers for several reasons:
(i) Simplifies computation: Scientific notation simplifies the computation of arithmetic operations by reducing the number of digits involved in the calculation.
(ii) Reduces errors: Scientific notation reduces the risk of errors in calculations because it is easier to keep track of the decimal places when working with small numbers.
(iii) Eases comparisons: Scientific notation makes it easier to compare numbers of different orders of magnitude.
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HELP ME ASAP!!! YOU WILL BE BRAILIEST!!!!!!!
Answer:
See step by step.
Step-by-step explanation:
lets define the events:
A: cuban festival C: tropical Garden
B: street art show D: african festival
a) theoretically the probability is
[tex]P(A)=P(B)=P(C)=P(D)= \frac{1}{4} = 0.25 \\[/tex]
This is 25% (for each one, equally)
b) The experimental probability is given by:
[tex]P(A)= \frac{32}{150} =0.2133[/tex]
[tex]P(B)= \frac{38}{150} =0.2533[/tex]
[tex]P(C)= \frac{35}{150} =0.2333[/tex]
[tex]P(D)= \frac{45}{150} =0.3000[/tex]
c) The theoretically probabilities are all equally, the experimental probabilities are close to 25% each one, but differ lightly each one, since is an experiment and the result is random.
the perimeter of a semicircular disc is 72cm. Find the radius of the disc
Answer:
The radius is approximately 14.003.
Step-by-step explanation:
Given:
Perimeter = 72Formulas for the semicircle:
d = 2 ra = π rp = π r + 2 rS = π r2 / 2Answer:
14 cm
Step-by-step explanation:
To find:-
Radius of the disc .Answer:-
We are here given that the perimeter of a semicircular disc is 72cm . We are interested in finding out the radius of the disc. Perimeter of a semicircular disc is given by,
[tex]:\implies \sf P = \pi r + 2r \\[/tex]
where r is the radius of the disc
Now on substituting the respective values, we have;
[tex]:\implies \sf 72cm = \pi r + 2r \\[/tex]
[tex]:\implies \sf 72cm = r(\pi + 2)\\[/tex]
[tex]:\implies \sf r =\dfrac{72}{\pi+2} cm \\[/tex]
[tex]:\implies \sf r =\dfrac{72}{3.14+2} cm \\[/tex]
[tex]:\implies \sf r = \dfrac{72}{5.14}\\[/tex]
[tex]:\implies \sf \pink{radius= 14.007\ cm } \\[/tex]
Hence the radius of the semicircular disc is approximately 14 cm .
The population of a certain city was 3,846 in 1996. It is expected to decrease by about 0.27% per year. Write an exponential decay function, and use it to approximate the population in 2022.
Answer:
To write an exponential decay function for this situation, we can use the formula:
P(t) = P₀e^(rt)
where:
P(t) = the population at time t
P₀ = the initial population
r = the annual rate of decrease (as a decimal)
t = time in years
We are given P₀ = 3,846 and r = -0.0027 (since the population is decreasing).
To approximate the population in 2022, we need to find t, the number of years from 1996 to 2022. That is:
t = 2022 - 1996 = 26 years
Now we can plug in the values we have:
P(t) = 3,846 e^(-0.0027t)
To find P(2022), we plug in t = 26:
P(26) = 3,846 e^(-0.0027(26))
≈ 3,200.62
Therefore, we can approximate the population of the city in 2022 to be about 3,201 people.
Answer:
3,101
Step-by-step explanation:
Please hit brainliest if this helped!
To write an exponential decay function for the population of the city, we can use the formula:
P(t) = P₀e^(-rt)
where P(t) is the population at time t, P₀ is the initial population, r is the decay rate, and e is the base of the natural logarithm.
In this problem, P₀ = 3,846 and r = 0.0027 (0.27% expressed as a decimal). We want to find the population in 2022, which is 26 years after 1996.To use the formula, we need to convert 26 years to the same time units as the decay rate. Since the decay rate is per year, we can use 26 years directly. Therefore, the exponential decay function for the population is:
P(t) = 3,846e^(-0.0027t)
To find the population in 2022 (t = 26), we substitute t = 26 into the function:
P(26) = 3,846e^(-0.0027*26) ≈ 3,101
Therefore, the population in 2022 is approximately 3,101.
Let me know if this helped by hitting brainliest! If you have any questions, comment below and I"ll get back to you ASAP.
Match the definition:HistogramBinDescriptive StaticsMeanMedianModeStandard deviationA. The scatter around a central pointB. is a measure of a data’s variabilityC. is a graph of the frequency distribution of a set of dataD. values calculated from a data set and used to describe some basic characteristics of the data setE. a group in a histogramF. the middle value of a sorted set of dataG. is the most commonly occurring value in a data set
The matches of Histogram, Bin, Descriptive Statistics, Mean, Median and Standard Deviation are C, E, D, A, F, G and B respectively.
The Match the definition are given.
Histogram - C). is a graph of the frequency distribution of a set of data
Bin - E). a group in a histogram
Descriptive Statistics - D). values calculated from a data set and used to describe some basic characteristics of the data set
Mean - A). The scatter around a central point
Median - F). the middle value of a sorted set of data
Mode - G). is the most commonly occurring value in a data set
Standard Deviation - B). is a measure of a data’s variability
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What are the coordinates of the point on the directed line segment from (-6, 6) to
(2, -10) that partitions the segment into a ratio of 1 to 3?
The coordinates of the point we are looking for are (2, -9).
What are the coordinates of the point ?
The origin is the point at which all lines in a coordinate system intersect. When x and y are both equal to zero, the axes intersect. The origin's coordinates are (0, 0).
To find the coordinates of the point that partitions the line segment from (-6, 6) to (2, -10) into a ratio of 1 to 3, we can use the following formula:
(x, y) = ((32 - 1(-6))/4, (3*(-10) - 1*6)/4)
Here, the ratio of 1 to 3 corresponds to the fact that we are partitioning the line segment into 4 equal parts, with the point we want to find being at the end of the first part (i.e., 1/4 of the way from (-6, 6) to (2, -10)).
Plugging in the values, we get:
(x, y) = ((32 + 6)/4, (3(-10) - 6)/4)
= (2, -9)
Therefore, the coordinates of the point we are looking for are (2, -9).
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PLease help me and answer the questions in the picture below you will make my day!
Answer:
b the solution is (3,5)
Step-by-step explanation:
look at the points where the lines intersect
[TRUE OR FALSE] whenever two variables are correlated, we assume that one variable is the cause of the observed effect from the other variable.
Whenever two variables are correlated, we assume that one variable is the cause of the observed effect from the other variable.
It is a false statement,
Two variables that move together, or in the same direction, are said to have a positive correlation. When one variable rises while the other rises or when one variable falls while the other falls, there is a positive correlation. These two separate variables are theoretically influenced by the same outside factors because they travel in the same direction.
Whenever two variables are correlated, we assume that one variable is the cause of the observed effect from the other variable.
It is a false statement,
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A company produced in the first quarter 6,905 pieces in the second quarter the same company produced 795 pieces more than in the first quarter under these conditions how many pieces did the company produce in the first semester?
Answer: 14,605 pieces.
Step-by-step explanation:
In the second quarter, the company produced 795 pieces more than in the first quarter.
So, the total pieces produced in the second quarter can be calculated as:
6905 + 795 = 7700
The total pieces produced in the first semester (two quarters) can be calculated as:
6905 + 7700 = 14,605
Therefore, the company produced 14,605 pieces in the first semester.
The number of pieces the company produced in the first semester was 14,605 pieces.
How many?The question asks to calculate how many pieces a company produced in the first semester, considering the production of two quarters.
In the first quarter, the company produced 6,905 pieces, as indicated in the question.
Already in the second quarter, the company produced 795 more pieces than in the first quarter, which means that the production in the second quarter was:
6,905 + 795 = 7,700 pieces.
To know the company's total production in the first semester, just add the productions of the two quarters:
6,905 + 7,700 = 14,605 pieces
ONQ is a sector of a circle with centre O and radius 13 cm. A is the point on ON and B is the point on OQ such that AOB is an equilateral triangle of side 9 cm. Calculate the area of the shaded region as a percentage of the area of the sector ONQ. Give your answer correct to 1 decimal place.
The area of the shaded region as a percentage of the area of the sector ONQ= 60.3%
What is an equilateral triangle?The shape of an equilateral triangle is an equilateral triangle.
The word "Equilateral" is formed by combining two words. H. "Equi" means equal, "lateral" means side.
Equilateral triangles are also called regular polygons or equilateral triangles because all sides are equal.
In geometry, an equilateral triangle is a triangle with all sides of equal length.
Three sides are equal, so three angles on the same side are equal. Therefore, it is also called an equilateral triangle with each angle of 60 degrees.
Like other types of triangles, equilateral triangles have formulas for area, perimeter, and height.
According to our question-
AB=OA=BO= 9CM
ONQ-AOB/ONQ*100
PUTTING VALUES
60.3%
Hence, The area of the shaded region as a percentage of the area of the sector ONQ= 60.3%
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Given the following Confidence Interval for the population proportion p : (0.607, 0.667),
find the margin of error used to obtain it.
Answer:
0.03
Step-by-step explanation:
So we can tell that our population parameter is p-hat = 0.637, which is 0.03 apart from the upper and lower bounds of the confidence interval. This means that 0.03 is our margin of error, or how much room there is for error.
If the gradient of the equation 2x-ay+2=0 is 1. Then find the value of a.
Step-by-step explanation:
2x + ay + 2 = 0
the gradient or slope of the line is the factor m of x in the form
y = mx + b
so let's transform the given equation into that form :
ay = -2x - 2
y = (-2/a)x - 2/a
we know that m = 1.
so,
-2/a = 1
-2 = a
Using the regression line equation Y hat=1.7656 + 0,8073X what supervisor rating would we expect if a person had a selection test score of x=6?
we would expect a supervisor rating of approximately 6.61 if a person had a selection test score of 6.
How to find supervisor rating?A mathematical sentence with two equal parts and an equal sign is called an equation. An illustration of an equation is 4 + 6 = 10. 4 plus 6 can be seen on the equal sign's left side, and 10 can be seen on the equal sign's right side.
To find the supervisor rating we would expect for a person with a selection test score of 6, we can plug 6 in for X in the regression line equation:
[tex]$$\hat{Y} = 1.7656 + 0.8073X$$[/tex]
So:
[tex]$$\hat{Y} = 1.7656 + 0.8073(6)$$[/tex]
Simplifying
[tex]$$\hat{Y} = 1.7656 + 4.8438$$[/tex]
[tex]$$\hat{Y} = 6.6094$$[/tex]
Therefore, we would expect a supervisor rating of approximately 6.61 if a person had a selection test score of 6.
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What is the line's slope?
Answer: y=3x+0
Step-by-step explanation: rise (y) over run (x) would be 3/1, which is 3. The line passes through the origin (0,0) so its 0.
The circle below has center O, and its radius is 6 yd. Given that m ZAOB-110°, find the area of the shaded region and the length of the arc AB.
Give exact answers in terms of x, and be sure to include the correct units in your answer.
Area of shaded region:
Length of AB:
The length of arc AB is 7pi/3 yards is the area of the shaded region and the length of the arc AB.
what is circle?
A circle is a geometric shape that consists of all points in a plane that are equidistant from a fixed point called the center.
To find the area of the shaded region and the length of arc AB, we need to first find the measure of angle ZAB. Let's call this angle x.
Since angle ZAOB measures 110 degrees and angle ZAB and angle BOA are vertical angles, we know that angle BOA also measures 110 degrees. Therefore, angle ZAB + angle BOA = 180 degrees.
So, we can write:
x + 110 = 180
Solving for x, we get:
x = 70
Now, we can use the formula for the area of a sector to find the area of the shaded region. The sector is defined by the central angle ZOB, which measures 360 - 110 - 70 = 180 degrees. So, we have:
Area of shaded region = (180/360) * pi * 6^2 = 18pi
Therefore, the area of the shaded region is 18pi square yards.
To find the length of arc AB, we can use the formula:
Length of arc AB = (x/360) * 2 * pi * 6
Plugging in x = 70, we get:
Length of arc AB = (70/360) * 2 * pi * 6 = 7pi/3
Therefore, the length of arc AB is 7pi/3 yards.
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Ignacio makes a display shelf from 4 wooden boards. All angles formed by the
boards are right angles. Ignacio plans to stain all faces of the shelf, except the
back face, which will be against the wall. What is the total area Ignacio will
stain? Show your work.
512
7 in.
1
2
32 in.
30 in.
72
17
56
9 in.
4 in.
512
24
A
329-30.7
72
Answer:
shelf area = 19018.33 square inches
Step-by-step explanation:
shelf area calculation:
Ignacio makes a display shelf from 4 wooden boards. All angles formed by the boards are right angles. Ignacio plans to stain all faces of the shelf, except the back face, which will be against the wall. What is the total area Ignacio will stain? Show your work. 512 7 in. 1 2 32 in. 30 in. 72 17 56 9 in. 4 in. 512 24 A 329-30.7 72
To find the total area that Ignacio will stain, we first need to determine the area of each face that will be stained.
Let's label the boards as follows:
Board 1: 512 in x 7 in
Board 2: 12 in x 32 in
Board 3: 30 in x 72 in
Board 4: 17 56/9 in x 4 in
For each board, we need to find the total area of all the faces that will be stained.
Board 1 has two faces that will be stained: the top face and the two side faces. The area of the top face is 512 in x 7 in = 3584 in^2. The area of each side face is 512 in x 12 in = 6144 in^2. So the total area of all three faces is 3584 in^2 + 2 x 6144 in^2 = 15872 in^2.
Board 2 has three faces that will be stained: the top face and the two side faces. The area of the top face is 12 in x 32 in = 384 in^2. The area of each side face is 12 in x 4 in = 48 in^2. So the total area of all three faces is 384 in^2 + 2 x 48 in^2 = 480 in^2.
Board 3 has three faces that will be stained: the top face and the two side faces. The area of the top face is 30 in x 72 in = 2160 in^2. The area of each side face is 72 in x 4 in = 288 in^2. So the total area of all three faces is 2160 in^2 + 2 x 288 in^2 = 2736 in^2.
Board 4 has two faces that will be stained: the top face and the side face. The area of the top face is 17 56/9 in x 4 in = 71 2/3 in^2. The area of the side face is 17 56/9 in x 9 in = 158 2/3 in^2. So the total area of both faces is 71 2/3 in^2 + 158 2/3 in^2 = 230 1/3 in^2.
To find the total area that Ignacio will stain, we just need to add up the areas of all the faces that will be stained:
15872 in^2 + 480 in^2 + 2736 in^2 + 230 1/3 in^2 = 19018 1/3 in^2
Therefore, the total area that Ignacio will stain is approximately 19018.33 square inches.
original question :
Ignacio makes a display shelf from 4 wooden boards. All angles formed by the boards are right angles. Ignacio plans to stain all faces of the shelf, except the back face, which will be against the wall. What is the total area Ignacio will stain? Show your work. 512 7 in. 1 2 32 in. 30 in. 72 17 56 9 in. 4 in. 512 24 A 329-30.7 72
chatgpt
A consumer price analyst claims that prices for liquid crystal display (LCD) computer monitors have a mean of $ 170 and a standard deviation of $ 55.
2. You randomly selected 9 LCD compute monitors. What is the probability that their mean cost is less than $ 180? Assume here that the prices are normally distributed
3. You randomly selected 36 LCD compute monitors. What is the probability that their mean cost is less than $ 180?
The probability that the mean cost of 9 LCD computer monitors is less than $180 is 0.8186 or 81.86% and the probability that the mean cost of 36 LCD computer monitors is less than $180 is 0.9999 or 99.99%.
What is the Central Limit Theorem (CLT)?
The Central Limit Theorem (CLT) is a statistical concept that states that the sample mean of a large number of independent and identically distributed (iid) random variables will be approximately normally distributed, regardless of the underlying distribution of the individual random variables.The significance of the Central Limit Theorem is that it allows us to make inferences about the population mean based on a sample mean, even if the population is not normally distributed. This is because the distribution of the sample mean becomes approximately normal as the sample size increases.
Finding the given probabilities:
To find the probability that the mean cost of 9 LCD computer monitors is less than $180, we can use the formula for the standard error of the mean:
[tex]SE = \sigma / \sqrt{n}[/tex]
where SE is the standard error of the mean, [tex]\sigma[/tex] is the population standard deviation, and n is the sample size. Plugging in the given values, we get:
[tex]SE = 55 / \sqrt(9) = 18.33[/tex]
Next, we can calculate the z-score corresponding to a sample mean of $180:
[tex]z = (180 - 170) / 18.33 = 0.546[/tex]
Using a standard normal distribution table or calculator, we can find the probability that a z-score is less than 0.546, which is 0.7079. However, we are interested in the probability that the sample mean is less than $180, which is the same as the probability that a standard normal variable is less than the calculated z-score. Therefore, the probability that the mean cost of 9 LCD computer monitors is less than $180 is:
[tex]P(z < 0.546) = 0.7079[/tex]
Rounding to four decimal places, we get 0.8186 or 81.86%.
To find the probability that the mean cost of 36 LCD computer monitors is less than $180, we can use the same formula for the standard error of the mean:
[tex]SE = \sigma / \sqrt{n}[/tex]
Plugging in the given values, we get:
[tex]SE = 55 / \sqrt{36} = 9.17[/tex]
Next, we can calculate the z-score corresponding to a sample mean of $180:
[tex]z = (180 - 170) / 9.17 = 1.090[/tex]
Using a standard normal distribution table or calculator, we can find the probability that a z-score is less than 1.090, which is 0.8621. However, we are interested in the probability that the sample mean is less than $180, which is the same as the probability that a standard normal variable is less than the calculated z-score. Therefore, the probability that the mean cost of 36 LCD computer monitors is less than $180 is:
[tex]P(z < 1.090) = 0.8621[/tex]
Rounding to four decimal places, we get 0.9999 or 99.99%.
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2 2.1 1.1 1.2 1.3 A contractor cofrected to supply water to the Altein ring-road has decided to investigate the fomial impact that the monthly instalents, salaries and the price of fuel bad to his business per month. The contractor will use ONE of his water tanken to conduct an investigation. The contractor was supplying water to the Altein village 5 km ring-road construction site where the road had to be paved using the paving bricks. The paving of the road has started in January 2022 and ran for 10 months. THE MERCEDES BENZ WATER TANKER Adapted from aquatransport.co.za The contractor is still paying for the truck (water tanker) and it is covered for insurance. Monthly Instalment of Truck: R22 301,67 Insurance: RB 500 Loan term: 60 months Write down the Loan term of the truck in years. Determine the monthly repayments that were made towards the water tanker including the insurance cover amount. The contractor had already made half of the monthly instalments towards the truck in June 2022. Determine the total amount of money that was owed to the financer excluding the insurance in June 2022. Give an explanation on the significance of including an insurance cover when a contractor purchases the water tanker. The driver of the water tanker works for 5½ days per week and 9 hours per day on week days except on Saturdays where they work for a ½ day (4,5 hours). The rate per hour was R92,50 and the rate of pay was doubled on Saturdays. Calculate the amount of money that the tanker driver receive per day during week days. sked in March (2) (2) (2)
Answer:
Loan term of the truck in years:
The loan term of the truck is 60 months. To convert this to years, we divide by 12 since there are 12 months in a year. Therefore, the loan term of the truck in years is:
60 months ÷ 12 months/year = 5 years
Monthly repayments including insurance:
The monthly instalment of the truck is R22,301.67 and the insurance cover is R500. Therefore, the total monthly repayment including insurance is:
R22,301.67 + R500 = R22,801.67
Total amount owed to the financer excluding insurance in June 2022:
Half of the monthly instalments have been made towards the truck in June 2022, which means that 5 months' worth of payments have been made. Therefore, the total amount owed to the financer excluding insurance in June 2022 is:
(R22,301.67 × 55) - R500 = R1,223,592.35
Significance of including insurance cover:
Including an insurance cover when purchasing the water tanker is important because it provides protection for the contractor against unforeseen events such as accidents, theft, or damage to the vehicle. In the event of an accident or theft, the insurance cover can help cover the costs of repairs or replacement of the vehicle, which can be a significant expense for the contractor. Additionally, having insurance can provide peace of mind for the contractor, knowing that they are covered in case of unexpected events.
Tanker driver's daily pay during weekdays:
The driver works for 5½ days per week and 9 hours per day on weekdays, which amounts to:
5.5 days/week × 9 hours/day = 49.5 hours/week
The rate per hour is R92.50, so the driver's pay per day during weekdays is:
49.5 hours/week × R92.50/hour ÷ 5 days/week = R909.75/day
GIven the functions f(x)-x^2+4x and g(x)=x-4 describe of show Bethany how she could find where f(x)=g(x) using a system of equations and name the values for x.
Answer:
A system of equations is when two equations equal each other. In this case, f(x) and g(x) must equal each other.
f(x) - g(x) = 0
x^2 - x + 4 - (x - 4) = 0
x^2 - 2x - 4 = 0
Using the Quadratic Formula:
x = (2 ± √20)/2
Therefore, the values for x are x = 2 and x = -3.
A bank requires that the Dotkoms pay their homeowner's insurance, property taxes, and
mortgage in one monthly payment to the bank. If their monthly mortgage payment is $1,711.22,
their semi-annual property tax bill is $3,239, and their annual homeowner's insurance bill is
$980, how much do they pay the bank each month?
Answer: $2,162.06
Step-by-step explanation:
To calculate the total monthly payment to the bank, we need to add up the monthly mortgage payment, the monthly portion of the semi-annual property tax bill, and the monthly portion of the annual homeowner's insurance bill.
First, we need to find the monthly portion of the semi-annual property tax bill. To do this, we divide the semi-annual property tax bill by 6 (since there are 6 months in half a year):
Monthly property tax payment = Semi-annual property tax bill / 6
Monthly property tax payment = $3,239 / 6
Monthly property tax payment = $539.83
Next, we need to find the monthly portion of the annual homeowner's insurance bill. To do this, we divide the annual homeowner's insurance bill by 12 (since there are 12 months in a year):
Monthly homeowner's insurance payment = Annual homeowner's insurance bill / 12
Monthly homeowner's insurance payment = $980 / 12
Monthly homeowner's insurance payment = $81.67
Now we can add up the monthly mortgage payment, the monthly property tax payment, and the monthly homeowner's insurance payment to find the total monthly payment to the bank:
Total monthly payment = Monthly mortgage payment + Monthly property tax payment + Monthly homeowner's insurance payment
Total monthly payment = $1,711.22 + $539.83 + $81.67
Total monthly payment = $2,332.72
Therefore, the Dotkoms pay the bank $2,332.72 each month.
Answer:
Step-by-step explanation:
Using proportions, it is found that they pay the bank $2332.72 each month.
What is a proportion?
A proportion is a fraction of a total amount.
Using proportions, it is found that they pay the bank $2332.72 each month.
What is a proportion?
A proportion is a fraction of a total amount.
Their payments are given by:
Monthly mortgage of $1,711.22.
Semi-annual property tax bill is $3,239, that is, it is paid every 6 months, hence 3239/6 = $539.83.
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E.12 GCF and LCM: word problems 288
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Franklin wishes to plant pumpkins and sunflowers, so this morning he bought packs of seeds
at a local gardening shop. Pumpkin seeds were sold in packages of 4 seeds, while sunflower
seeds were sold in packs of 8. If Franklin bought the same number of each type of seed, what
is the smallest number of pampkin seeds he must have bought?
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Therefore, the answer is that Franklin must have bought at least 4 packs of pumpkin seeds to have an equal number of pumpkin and sunflower seeds.
What do you mean by LCM?LCM stands for Least Common Multiple. It's the lowest positive number that's a multiple of two or further given figures. In other words, it's the lowest number that all the given figures divide into unevenly.For illustration, the LCM of 2 and 3 is 6, because 6 is the lowest number that's a multiple of both 2 and 3. Another illustration, the LCM of 4, 6, and 8 is 24, because 24 is the lowest number that's a multiple of all three of those figures.LCM is a useful conception in calculation, especially when dealing with fragments, because it helps us find a common denominatorGiven by the question.
Sure! Then is an explanation of how to break this problem
First, we need to find the least common multiple( LCM) of 4 and 8, because that will tell us the lowest number of seeds that Franklin could have bought. To find the LCM, we can list the multiples of each number until we find one that they've in common
Multiples of 4 4, 8, 12, 16, 20, 24, 28, 32, 36, 40.
Multiples of 8 8, 16, 24, 32, 40, 48, 56, 64.
The first multiple that appears in both lists is 8, so the LCM of 4 and 8 is 8.
Now we know that Franklin bought the same number of pumpkin seeds and sunflower seeds, and that number is a multiple of 8. So, we just need to find the lowest multiple of 8 that's also a multiple of 4. That is 8 itself, because it's formerly a multiple of 4.
So, Franklin must have bought at least 4 pumpkin seed packs, since each pack contains 4 seeds. Any other multiple of 8 that's also a multiple of 4 would also work, but 8 is the lowest similar number.
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