Which is the population standard deviation of the data set: 8, 9, 10, 11, 12?
a. 10.123
1.414
b.
2.654
Please select the best answer from the choices provided
A
C.
d. 10
B

The scalar potential is f(x,y) = xy + x^2 + y^2

The line integral over any smooth path C connecting A(0,0) to B(1,1) is ∫C F.dR = 3/2

A vector field F(x,y) is conservative if and only if it is the gradient of a scalar potential f(x,y):

F(x,y) = ∇f(x,y) = (∂f/∂x)i + (∂f/∂y)j

We can find f(x,y) by integrating the components of F(x,y):

∂f/∂x = x+2y => f(x,y) = 1/2 x^2 + xy + g(y)

∂f/∂y = 2x+y => f(x,y) = xy + x^2 + h(x)

Comparing the two expressions for f(x,y), we can see that g(y) = y^2 and h(x) = 0, so the scalar potential is:

f(x,y) = xy + x^2 + y^2

To evaluate the line integral over any smooth path C connecting A(0,0) to B(1,1), we can use the fundamental theorem of line integrals:

∫C F.dR = f(B) - f(A)

Substituting A(0,0) and B(1,1) into f(x,y), we get:

f(A) = 0

f(B) = 1 + 1 + 1 = 3

Therefore,

∫C F.dR = f(B) - f(A) = 3 - 0 = 3

The scalar potential is f(x,y) = xy + x^2 + y^2, and the line integral over any smooth path C connecting A(0,0) to B(1,1) is ∫C F.dR = 3.

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Based on the given quadratic equation, the student's work is correct?

The correct answer choice is option C

10x² + 31x - 14 = 0

Using factorization method

(10 × -14) = -140

31

Find two numbers whose product is -140 and sum is 31

So,

35 × -4 = -140

35 + (-4) = 31

Then,

10x² + 35x - 4x - 14 = 0

5x(2x + 7) -2(2x + 7) = 0

(5x - 2) (2x + 7) = 0

5x - 2 = 0. 2x + 7 = 0

5x = 2. 2x = -7

x = 2/5. x = -7/2

Hence, the value of x is ⅖ or -7/2

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The indefinite integral of (-4x^6 + 2x^5 - 3x^3 + 3) is -4(x^7/7) + 2(x^6/6) - 3(x^4/4) + 3x + C, where C is an arbitrary constant.

We can integrate each term separately:

∫(-4x^6 + 2x^5 - 3x^3 + 3) dx = -4∫x^6 dx + 2∫x^5 dx - 3∫x^3 dx + 3∫1 dx

Using the power rule of integration, we get:

∫x^n dx = (x^(n+1))/(n+1) + C

where C is the constant of integration.

Therefore,

-4∫x^6 dx + 2∫x^5 dx - 3∫x^3 dx + 3∫1 dx = -4(x^7/7) + 2(x^6/6) - 3(x^4/4) + 3x + C

Hence, the indefinite integral of (-4x^6 + 2x^5 - 3x^3 + 3) is:

-4(x^7/7) + 2(x^6/6) - 3(x^4/4) + 3x + C, where C is an arbitrary constant.

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The value of the indefinite integral ∫(-4x^6 + 2x^5 - 3x^3 + 3) dx is given by the expression -4/7 * x^7 + 1/3 * x^6 - 3/4 * x^4 + 3x, without including +C.

To evaluate the indefinite integral ∫(-4x^6 + 2x^5 - 3x^3 + 3) dx, we can integrate each term separately using the power rule for integration.

The power rule states that the integral of x^n with respect to x is (1/(n+1))x^(n+1), where n is not equal to -1.

Using the power rule, we can integrate each term as follows:

∫(-4x^6) dx = (-4) * (1/7)x^7 = -4/7 * x^7

∫(2x^5) dx = 2 * (1/6)x^6 = 1/3 * x^6

∫(-3x^3) dx = -3 * (1/4)x^4 = -3/4 * x^4

∫(3) dx = 3x

Combining the results, the indefinite integral becomes:

∫(-4x^6 + 2x^5 - 3x^3 + 3) dx = -4/7 * x^7 + 1/3 * x^6 - 3/4 * x^4 + 3x

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The side of the pentagonal koi pond with the deck around it is (3x/2) feet where x is the length of each interior side.

Let the side of the pentagon be x feet.

Since there are five sides, the sum of all the interior angles is (5 – 2) × 180 = 540°.

Each angle of the pentagon is given by 540°/5 = 108°.

The deck of equal width is provided around the pond, so let the width be w feet.

Therefore, the side of the pentagon with the deck around it has length (x + 2w) feet.

The length of the exterior side of the pentagon is equal to the length of the corresponding interior side plus the width of the deck.

Therefore, the length of the exterior side of the pentagon is (x + 3w) feet.

We know that the lengths of the exterior sides of the pentagon are equal.

Therefore, the length of each exterior side is (x + 3w) feet.

So,

(x + 3w) × 5 = 5x.

Solving this equation gives 2w = x/2.

So, the side of the pentagon with the deck around it is (x + x/2) feet or (3x/2) feet.

Therefore, the side of the pentagonal koi pond with the deck around it is (3x/2) feet where x is the length of each interior side.

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The obtained t-value is approximately (b) 3.46.

The obtained t-value can be calculated using the formula:

t = ΣD / (sD / √(n))

where ΣD is the sum of the differences between paired observations, sD is the standard deviation of the differences, and n is the sample size.

Given ΣD = 24, n = 8, and s₂D = 6, we can find sD by taking the square root of s₂D:

sD = √(s₂D) = √(6) ≈ 2.45

Substituting the given values, we get:

t = ΣD / (sD / √(n)) = 24 / (2.45 / √(8)) ≈ 3.46

Therefore, the obtained t-value is approximately (b) 3.46.

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The time John will use to mow the lawn is 40 minutes.

The time Sally will use to mow the lawn is 24 minutes.

it takes john 16 minutes longer than Sally to mow the lawn. if they work together they can mow the lawn in 15 minutes.

Therefore, let's find the time each can mow the lawn alone as follows:

let

x = time Sally use to mow the lawn

John will take x + 16 minutes to mow the lawn.

Therefore,

1 / x + 1 / x + 16 = 1 / 15

x + 16 + x / x(x + 16) = 1 / 15

2x + 16 / x(x + 16) = 1 / 15

cross multiply

30x + 240 = x² + 16x

x² + 16x - 30x  - 240 = 0

x² - 14x  - 240 = 0

(x - 24)(x + 10)

Hence,

x = 24 minutes

Therefore,

time used by John = 24 + 16 = 40 minutes

time used by Sally = 24 minutes

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Arithmetic Average Return = 19%

Standard Deviation = 0.307 or 30.7%

Average Nominal Risk Premium = 13.9%

a. The arithmetic average return on the company's stock over this five-year period is:

Arithmetic Average Return = (21% + 17% + 26% + 27% + 4%) / 5

Arithmetic Average Return = 19%

b. To calculate the variance, we first need to find the deviation of each return from the average return:

Deviation of Returns = Return - Arithmetic Average Return

Using the arithmetic average return calculated in part (a), we get:

Deviation of Returns = (21% - 19%), (17% - 19%), (26% - 19%), (27% - 19%), (4% - 19%)

Deviation of Returns = 2%, -2%, 7%, 8%, -15%

Then, we can calculate the variance using the formula:

Variance = (1/n) * Σ(Deviation of Returns)^2

where n is the number of observations (in this case, n=5) and Σ means "the sum of".

Variance = (1/5) * [(2%^2) + (-2%^2) + (7%^2) + (8%^2) + (-15%^2)]

Variance = 0.094 or 9.4%

The standard deviation is the square root of the variance,

Standard Deviation = √0.094

Standard Deviation = 0.307 or 30.7%

c. The average nominal risk premium on the company's stock is the difference between the average return on the stock and the average T-bill rate over the period. The average T-bill rate is given as 5.1%, so:

Average Nominal Risk Premium = Arithmetic Average Return - Average T-bill Rate

Average Nominal Risk Premium = 19% - 5.1%

Average Nominal Risk Premium = 13.9%

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The maximize his score the student should answer 5 computation problems and 5 word problems in a maximum score of 80.

Let number of computation problems answered as C and the number of word problems answered as W.

Given the time constraint of 35 minutes, we can set up the following equation:

2C + 5W ≤ 35

Since the student may answer no more than 10 problems, we have another constraint:

C + W ≤ 10

The student wants to maximize their score, which is calculated as:

Score = 6C + 10W

First, let's solve the system of inequalities to determine the feasible region:

2C + 5W ≤ 35

C + W ≤ 10

We find that when C = 5 and W = 5, both constraints are satisfied, and the score is:

Score = 6C + 10W

= 6(5) + 10(5)

= 30 + 50

= 80

Therefore, to maximize his score the student should answer 5 computation problems and 5 word problems in a maximum score of 80.

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the solution to the equation is a = 34/9. To solve the equation:

5a - ((a+2)/2) - ((2a-1)/3) + 1 = 3a + 7

We can begin by simplifying the fractions on the left-hand side:

5a - (a/2) - 1 - (2/3)a + (1/3) + 1 = 3a + 7

Combining like terms on both sides:

(9/2)a + 1/3 = 3a + 6

Subtracting 3a from both sides:

(3/2)a + 1/3 = 6

Subtracting 1/3 from both sides:

(3/2)a = 17/3

Multiplying both sides by 2/3:

a = 34/9

Therefore, the solution to the equation is a = 34/9.

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(a)n = 82 ,(b)n = -46,(c) n = -26 ,d)n = 28

(a) To solve for n, we can use the formula:  mod n = (divisor x quotient) + remainder.

Using the information given, we have:
n = (7 x 11) + 5
n = 77 + 5
n = 82

Therefore, the value of n is 82.

(b) Using the same formula, we have:
n = (5 x -10) + 4
n = -50 + 4
n = -46

Therefore, the value of n is -46.

(c) Applying the formula again, we have:
n = (11 x -3) + 7
n = -33 + 7
n = -26

Therefore, the value of n is -26.

(d) Using the formula, we have:
n = (10 x 2) + 8
n = 20 + 8
n = 28

Therefore, the value of n is 28.

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The standard deviation of a standard normal distribution is always equal to one. The correct answer is (b) is always equal to one.

The standard deviation of a standard normal distribution refers to the amount of variability or spread in the data. In a standard normal distribution, which has a mean of zero and a variance of one, the standard deviation is always equal to one.

This means that approximately 68% of the data falls within one standard deviation of the mean, 95% of the data falls within two standard deviations of the mean, and 99.7% of the data falls within three standard deviations of the mean.

This property of a standard normal distribution makes it a useful tool in statistical analysis and hypothesis testing. However, it is important to note that the standard deviation of a normal distribution with a different mean and variance can have a different value than one.

Therefore, the correct answer is (b) is always equal to one.

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The inner product of f(x)=-2cos(2x) and g(x)=-sin(2x) is 0.

To find the inner product of f(x) and g(x), we use the formula:

⟨f,g⟩= ∫[a,b] f(x)g(x)dx

where [a,b] is the interval of integration.

Substituting the given functions, we get:

⟨f,g⟩= ∫[0,π] -2cos(2x)(-sin(2x))dx

= 2 ∫[0,π] sin(2x)cos(2x)dx

Using the identity sin(2θ)cos(2θ) = sin(4θ)/2, we get:

⟨f,g⟩= ∫[0,π] sin(4x)/2 dx

= [-cos(4x)/8]π0

= (-1/8)[cos(4π)-cos(0)]

= (-1/8)[1-1]

= 0

Therefore, the inner product of f(x) and g(x) is 0.

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True statement: rolling a number greater than 4 on a six-sided number

A probability is a numerical description of how likely an event is to occur or how likely it is for a proposition to be true. It is measured on a scale of 0 to 1, with 0 indicating that the event is impossible, and 1 indicating that the event is certain.

The answer is D, rolling a number greater than 4 on a six-sided number cube. A probability of 1/2 means there is a 50% chance that the event will occur, which is the same as a 50-50 chance. The events A, B, and C all have a probability of 1/2.

Rolling an odd number on a six-sided number cube has a probability of 1/2 because three of the six numbers are odd (1, 3, 5), and the other three are even (2, 4, 6).

As a result, half of the possible results are odd. Picking a blue marble from a bag of 6 red marbles and 6 blue marbles has a probability of 1/2 because half of the marbles in the bag are blue.

A flipped coin landing on heads has a probability of 1/2 because there are two possible outcomes, heads or tails. The probability of rolling a number greater than 4 on a six-sided number cube is not 1/2.

There are only two numbers (5 and 6) that are greater than 4, out of a total of six possible outcomes, which means the probability is 2/6 or 1/3. Thus, the correct answer is D, rolling a number greater than 4 on a six-sided number cube.

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Answer:

Step-by-step explanation:

4. Volume of a cone = 1/3 π r^2 h.

Here h = 11.2 and r = 5.5 * 1/2 = 2.75.

So

Volume = 1/3 * π * 2.75^2 * 11.2

              =   88.6976 m^3

5.

Area of cylinder

= 2πr^2 + 2πrh

= 2π*7.5^2 + 2π*7.5*24.3

= 1498.5 m^2

6. T S A = πr(r + l)    where r = radis and l = slant height

= π*6(6+13)

= 114π

= 358.1 in^2.

In triangle FGH, we are given the following information: side f has a length of 8.8 inches, angle F measures 23 degrees, and angle G measures 107 degrees.  The length of side g is 20.5 inches

To determine the length of side g, we can utilize the Law of Sines, which relates the lengths of the sides of a triangle to the sines of their opposite angles. The law states that the ratio of the length of a side to the sine of its opposite angle is constant for all sides and angles in a triangle.

Applying the Law of Sines to triangle FGH, we have:

[tex]sin(F) / f = sin(G) / g[/tex]

Substituting the given values:

[tex]sin(23°) / 8.8 = sin(107°) / g[/tex]

To solve for g, we can cross-multiply and rearrange the equation:

[tex]g = (8.8 * sin(107°)) / sin(23°)[/tex]

Using a calculator, we can evaluate the expression:

[tex]g = 20.53 inches[/tex]

Rounding to the nearest tenth of an inch, the length of side g is approximately 20.5 inches.

Therefore, in triangle FGH, the length of side g is 20.5 inches (rounded to the nearest tenth).

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The given expression (3x²+x-1)/√x simplifies to √x(3x+1-1/x).

The given expression is given as follows:

(3x²+x-1)/√x

To simplify the expression (3x²+x-1)/√x, we can start by multiplying the numerator and denominator by √x.

This will allow us to eliminate the square root in the denominator and simplify the expression:

(3x²+x-1)/√x × √x/√x

= √x(3x²+x-1)/x

= √x(3x+1-1/x)

Therefore, (3x²+x-1)/√x simplifies to √x(3x+1-1/x).

We multiplied the numerator and denominator by √x to eliminate the square root in the denominator and then simplified the resulting expression by dividing the numerator by x.

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The complete question is as follows:

Solve this expression:

(3x²+x-1)/√x

The percentage of the bag that is cement is 25%

Percentage basically means a part per hundred. It can be expressed in fraction form as well as decimal form. It is put Ina symbol like %.

For example, if the number of mangoes in a basket of fruit is 50 and there 100 fruits in the basket, the percentage of mango in the basket is

50/100 × 100 = 50%

Similarly, the total mass of the bag is 1kg, we need to convert this to gram

1kg = 1 × 1000 = 1000g

Therefore the percentage of cement = 250/1000 × 100

= 1/4 × 100 = 25%

Therefore 25% of the bag is cement.

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The probability from a batch of 1000 chocolate bars of getting at least 1 golden ticket is 2.47% and the probability of getting all 5 golden tickets is extremely low is 0.0000000121%.

We'll first calculate the probabilities of not getting a golden ticket and then use that to find the desired probabilities.

In Charlie and the Chocolate Factory, there are 5 golden tickets and 995 non-golden tickets in a batch of 1000 chocolate bars. When you purchase 5 chocolate bars, the probabilities are as follows:

1. Probability of getting at least 1 golden ticket:
To find this, we'll first calculate the probability of not getting any golden tickets in the 5 bars. The probability of not getting a golden ticket in one bar is 995/1000.

So, the probability of not getting any golden tickets in 5 bars is (995/1000)^5 ≈ 0.9752.

Therefore, the probability of getting at least 1 golden ticket is 1 - 0.9741 ≈ 0.02475 or 2.47%.

2. Probability of getting 5 golden tickets:
Since there are 5 golden tickets and you buy 5 chocolate bars, the probability of getting all 5 golden tickets is (5/1000) * (4/999) * (3/998) * (2/997) * (1/996) ≈ 1.21 × 10-¹³or 0.0000000000121%.

So, the probability of getting at least 1 golden ticket is 2.47% and the probability of getting all 5 golden tickets is extremely low, at 0.0000000121%.

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The veterinarian weighs a client's dog on a scale. If the dog weighs 35. 16 pounds, the level of accuracy does the scale measure to the nearest hundredth is 0.01.The measurement of the scale to the nearest hundredth is 0.01.

A scale is an instrument that is used to measure the weight of an object. In this problem, the object is the dog that the veterinarian is weighing. If the dog weighs 35.16 pounds, the scale can measure up to the nearest hundredth.To the nearest hundredth, the scale can measure up to 0.01. The hundredth is the second decimal place in a measurement, and to measure to the nearest hundredth, one must round the third decimal place to the nearest number.

The third decimal place in 35.16 is 6, which is closer to 5 than 7.

Therefore, the measurement of the scale is 35.16 to the nearest hundredth.

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(a)The antiderivative of f(x) = 1/x with C=0 is ln|x|.

(b)The antiderivative of g(x) = 5/x with C=0 is 5 ln|x|.

(c)The antiderivative of h(x) = 4 - 3/x with C=0 is 4x - 3 ln|x|.

a. To find the antiderivative of f(x) = 1/x^b, we use the power rule of integration. The power rule states that if f(x) = x^n, then the antiderivative of f(x) is (1/(n+1))x^(n+1) + C. Applying this rule, we get:

∫(1/x^b) dx = x^(-b+1)/(-b+1) + C

Simplifying the above expression, we get:

∫(1/x^b) dx = (-1/(b-1))x^(1-b) + C

Therefore, the antiderivative of f(x) = 1/x^b with C=0 is (-1/(b-1))x^(1-b).

b. To find the antiderivative of g(x) = 5/x^c, we again use the power rule of integration. Applying this rule, we get:

∫(5/x^c) dx = 5/(1-c)x^(1-c) + C

Simplifying the above expression, we get:

∫(5/x^c) dx = (5/(c-1))x^(1-c) + C

Therefore, the antiderivative of g(x) = 5/x^c with C=0 is (5/(c-1))x^(1-c).

c. To find the antiderivative of h(x) = 4 - 3/x, we split the integral into two parts and use the power rule of integration for the second part. Applying the power rule, we get:

∫(4 - 3/x) dx = 4x - 3 ln|x| + C

Therefore, the antiderivative of h(x) = 4 - 3/x with C=0 is 4x - 3 ln|x|.

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The sum of the given series is 4/7.

The given series has an alternating sign and a denominator that increases exponentially. The formula to find the sum of such a series is a/(1-r), where 'a' is the first term and 'r' is the common ratio.

Here, 'a' is 3/4 and 'r' is -1/4. Plugging these values in the formula, we get the sum of the series as 4/7.

To find the sum of an infinite series with alternating signs and a denominator that increases exponentially, we can use the formula a/(1-r), where 'a' is the first term and 'r' is the common ratio.

Here, the first term is 3/4 and the common ratio is -1/4. Plugging these values in the formula gives the sum of the series as 4/7. This means that as we keep adding terms to the series, the sum approaches 4/7, but never quite reaches it.

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We can conclude that 5,200 feet is less than 1 mile 40 inches.

To compare the two measurements, we need to convert them to a common unit. In this case, we will convert both measurements to feet for easier comparison.

Given:

1 mile = 5,280 feet

1 inch = 1/12 feet

Converting 1 mile 40 inches to feet:

1 mile = 5,280 feet

40 inches = (40/12) feet = 3.3333 feet (rounded to 4 decimal places)

So, 1 mile 40 inches is equal to approximately 5,283.3333 feet (rounded to 4 decimal places).

Now, we can compare this value to 5,200 feet. We can see that 5,200 feet is less than 5,283.3333 feet.

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We can compare the two lengths.5,200 ft 145 in is greater than 1 mi 40 in.

To compare the two lengths in the question, we need to convert both into the same unit of measure. Here, we will convert both of them into inches.First, let's convert 5,200 ft 145 in into inches.

1 ft = 12 in 5200 ft = 5200 * 12 = 62400 in

Thus, 5,200 ft 145 in = 62400 + 145 = 62545 in

Now let's convert 1 mi 40 in into inches.

1 mi = 5280 ft1 ft = 12 in1 mi = 5280 * 12 = 63,360 in

Thus, 1 mi 40 in = 63,360 + 40 = 63,400 in

Now we can compare the two lengths.62545 in is greater than 63,400 in.Therefore, 5,200 ft 145 in is greater than 1 mi 40 in.

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To express 10cos30 - 3tan60 in the form of a square root of k, where k is an integer, we can use the fact that cosine and tangent are both periodic functions with a period of 2π.

Specifically, we can write:

10cos30 - 3tan60 = 10cos(30 + 2π) - 3tan(60 + 2π)

= 10cos(30) - 3tan(60)

= 10(cos(30) - sin(30)sin(60))

= 10(cos(30) - sin(60))

= 10cos(60)

Therefore, 10cos30 - 3tan60 is equal to 10cos(60), which is in the form of a square root of k, where k is an integer.

So the answer is:

10cos30 - 3tan60 = 10cos(60)

or in the form of a square root of k:

sqrt(10)(cos(60))

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Answer:

the answer is A

Step-by-step explanation:

Answer:

A. - ∞ < x < ∞

Step-by-step explanation:

The given points m and n can be plotted on a number line as shown below:The point m represents the opposite of -1/2. The opposite of a number is the number that has the same absolute value but has a different sign. Thus, the opposite of -1/2 is 1/2.

The point m lies at a distance of 1/2 units from the origin to the left side of the origin.The point n represents the opposite of 5/2. Thus, the opposite of 5/2 is -5/2.

The point n lies at a distance of 5/2 units from the origin to the right side of the origin.

The number line that correctly shows m and n is shown below:As we can see, the points m and n are plotted on the number line.

The point m lies to the left of the origin and the point n lies to the right of the origin.

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The total time it will take Montraie to drive from City X to City Y is:

5 hours and 12 minutes

The scale drawing, it would be difficult to determine the distance between City X and City Y.

But since we have the scale drawing, we can use it to find the actual distance between the two cities.

The scale drawing, we see that the distance between City X and City Y is 3 inches.

Using the given scale of 1/4 inch = 13 miles, we can set up a proportion to find the actual distance:

1/4 inch / 13 miles = 3 inches / x miles

Cross-multiplying, we get:

1/4 inch × x miles = 13 miles × 3 inches

Simplifying, we get:

x = 156 miles

So the distance between City X and City Y is 156 miles.

To find the time it will take Montraie to drive from City X to City Y, we can use the formula:

time = distance / speed

Plugging in the values we know, we get:

time = 156 miles / 30 miles per hour

Simplifying, we get:

time = 5.2 hours

To convert this to hours and minutes, we can separate the whole number and the decimal part:

5 hours + 0.2 hours

To convert the decimal part to minutes, we can multiply it by 60:

0.2 hours × 60 minutes per hour = 12 minutes

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Based on Faaria's sample, the proportion of the students would dye their hair blue is given as follows:

0.2 = 20%.

A relative frequency is obtained with the division of the number of desired outcomes by the number of total outcomes.

A relative frequency, calculated from a sample, is the best estimate for the population proportion of the feature.

2 out of 10 students Faaria asked said they would, hence the estimate of the proportion of the students would dye their hair blue is given as follows:

p = 2/10 = 0.2 = 20%.

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The true statement is A, the line is steeper and the y-intercept is translated down.

So we have two lines, the first one is:

f(x) = x

The second line, the transformed one is:

g(x) = (5/4)*x - 1

Now, we have a larger slope, which means that the graph of line g(x) will grow faster (or be steeper) and we can see that we have a new y-intercept at y = -1, so the y-intercept has been translated down.

Then the correct option is A.

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The approximate margin of error for each confidence level in the situation is:0.07, 0.04 and 0.03.What is margin of error?Margin of error refers to the extent of error that is possible when conducting research, or measuring a sample group in the population. A confidence level is the range within which the researchers can have confidence that the actual percentage of the population falls.How to calculate margin of error:Margin of error is determined by using the formula:Margin of Error = Z score x Standard deviation of sample error.

The values of Z score for 90%, 95% and 99% confidence intervals are 1.64, 1.96 and 2.58 respectively.Calculating the standard deviation:From the data provided, we know that there were 240 favorable responses out of 350 surveys. The proportion can be calculated as;240/350 = 0.686The standard deviation of a sample proportion can be calculated by using the formula:SD = √((p * q) / n)where p is the proportion of success, q is the proportion of failures, and n is the sample size.SD = √((0.686 * (1 - 0.686)) / 350)SD = 0.0323Therefore,Margin of error for 90% confidence interval:ME = 1.64 * 0.0323ME ≈ 0.053Margin of error for 95% confidence interval:ME = 1.96 * 0.0323ME ≈ 0.063Margin of error for 99% confidence interval:ME = 2.58 * 0.0323ME ≈ 0.083Hence, the approximate margin of error for each level confidence l in this situation is 0.07, 0.04 and 0.03.

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The number of students who watched the games = (2/3)x = [2/3 * Total number of students] = [2/3 * x] = (2/3) x 150 = 100 students.

Let's assume that the total number of students in the school stadium is x. So,1/5 of the students were basketball players => (1/5)x2/15 of the students were soccer players => (2/15)x

So, the rest of the students watched the games => x - [(1/5)x + (2/15)x]

Let's simplify the given expressions=> (1/5)x = (3/15)x=> (2/15)x = (2/15)x

Now, we can add these fractions to get the value of the remaining students=> x - [(1/5)x + (2/15)x]

=> x - [(3/15)x + (2/15)x]

=> x - (5/15)x

=> x - (1/3)x = (2/3)x

Students who watched the games are (2/3)x

.Now we have to find out how many students watched the game. So, we have to find the value of (2/3)x.

We know that, the total number of students in the stadium = x

Hence, we can say that (2/3)x is the number of students who watched the games, and (2/3)x is equal to [2/3 * Total number of students] = [2/3 * x]

Therefore, the students who watched the game are (2/3)x.

Hence the solution to the given problem is that the number of students who watched the games = (2/3)x = [2/3 * Total number of students] = [2/3 * x] = (2/3) x 150 = 100 students.

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