PLEASE HELP WILL MARK BRAINLIEST

A researcher determined that the heights of male students in a
particular town are normally distributed with a mean of 63 inches and
a standard deviation of 1.5. Use the graph above to answer the
following questions:
67.5
a. What percentage of these students is taller than 66 inches?
b. If the data are based on 200 students, how many students are
between 60 and 64.5 inches tall? Explain.

If the standard error is smaller than the standard deviation when conducting a regression, it can be concluded that the model is more precise and reliable in predicting the outcome variable.

When conducting a regression, the standard error is a measure of the precision of the estimated regression coefficient. On the other hand, the standard deviation is a measure of the variability of the data points from the mean. If the standard error is smaller than the standard deviation, it means that the estimated regression coefficient is more precise than the variation of the data points. This indicates that the model is more reliable and accurate in predicting the outcome variable.
In practical terms, a smaller standard error means that the predicted values of the outcome variable will be closer to the actual values, resulting in more accurate predictions. However, it is important to note that a smaller standard error does not necessarily mean that the regression model is better. Other factors such as the goodness of fit, significance of the coefficients, and the overall explanatory power of the model should also be considered when evaluating the performance of a regression model.
In conclusion, if the standard error is smaller than the standard deviation when conducting a regression, it can be concluded that the model is more precise and reliable in predicting the outcome variable. However, other factors should also be taken into account to evaluate the overall performance of the model.

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The height of the telephone pole is approximately 26 feet.

According to the given information, the height of the man is 6 feet 2 inches, which we can represent as 6.17 feet, and his shadow is 9 feet 4 inches, which is 9.33 feet.

Using the concept of similar triangles, we can set up the following proportion:

(man's height) / (man's shadow) = (pole's height) / (pole's shadow)

Simplifying the proportion:

6.17 / 9.33 = h / 39.5

To solve for 'h', we can cross-multiply:

6.17 * 39.5 = 9.33 * h

243.215 = 9.33 * h

Dividing both sides by 9.33:

h ≈ 26.06

Rounding to the nearest whole foot, the height of the telephone pole is approximately 26 feet.

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Answer:

a = 157

b = 23

c = 157

Step-by-step explanation:

Angle b is a vertical angle to the angle measuring 23 so they are equal.

b = 23

Angle c  and the angle measuring 23 forms a straight line so they add to 180.

c+23 =180

c = 180-23

c = 157

Angle c and a are vertical angles so they are equal.

c = a = 157

Answer:

a = 157°

c = 157°

b = 23°

Step-by-step explanation:

We know that vertically opposite angles are equal.

∴ b = 23°

We know that angles in a straight line are added up to 180°.

∴ b + c = 180

23 + c = 180

c = 180 - 23

c = 157°

a = 157° ( vertically opposite angles ⇒ c = a )

Answer:

8 bags of cement

9 bags of sand

3 bags of stone

Step-by-step explanation:

Hope this helps :)

The total surface area of the pyramid is: 208.88 m²

The surface area of the pyramid is simply the sum of the areas of all the given surfaces.

Formula for the area of a triangle is:

Area = ¹/₂bh

where:

b is base

h is height

Area of four side triangles = 4(¹/₂ * 8 * 12) = 192 m²

Using Pythagoras theorem, the height of the base triangle is:

x = 4.22

Area of base = ¹/₂ * 8 * 4.22 = 16.88 m²

Total surface area = 192 + 16.88

= 208.88 m²

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Answer: they all have the same amount of squares but are placed differently in each example.

Step-by-step explanation:

there are 6 yellow squares and 10 blue squares for each of the 4 examples. The only difference is how they’re arranged.

The solution of the system of equations 5x-4y=34 and -x+8y=22 is x = -6 and y = 4, or (x, y) = (-6, 4).

Given the system of equation in the question;

5x - 4y = 34 _____1

-x + 8y = 22 _____2

To solve the system of equation, first solve for x in equation 2 and plug it  into equation 1.

-x + 8y = 22

x = 8y - 22 _____ 3

Plug equation 3 into equation 1

5x - 4y = 34

Plug in x = 8y - 22

5( 8y - 22 ) - 4y = 34

Solve for y

40y - 110 - 4y = 34

40y - 4y = 34 + 110

36y = 144

y = 144/36

y = 4

Plug y = 4 into equation 3

x = 8( 4 ) - 22

x = 32 - 22

x = 10

Therefore, the solution is x = 10 and y = 4.

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Saying you will destroy someone in a race could be positive or negative depending on the context of the situation.

Using the word "destroy" to describe beating someone in a race can be viewed as negative or positive, depending on the context and the relationship between the individuals.

In some situations, it may be seen as a playful or friendly challenge, indicating a competitive but good-natured spirit. However, in other cases, it may come across as aggressive or intimidating, potentially damaging the relationship between the participants.

It is important to consider the tone and the relationship when using language that could be interpreted as confrontational or threatening.

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These measurements are based on the Original ratio of 1 pouch of tuna to 26 oz (737g) of mayonnaise. If you prefer a different ratio of tuna to mayonnaise, the amounts needed for a double batch may be different.

If one pouch of tuna is mixed with 26 oz (737g) of mayonnaise to make a full batch, then to make a double batch of tuna, we need to double the amounts of both the tuna and the mayonnaise.

we simply need to multiply the amount of tuna in a single batch by 2:

1 pouch of tuna x 2 = 2 pouches of tuna

So, we need 2 pouches of tuna for a double batch.

26 oz (737g) of mayonnaise x 2 = 52 oz (1474g) of mayonnaise

So, we need 52 oz (1474g) of mayonnaise for a double batch.

Therefore, to make a double batch of tuna, we would need 2 pouches of tuna and 52 oz (1474g) of mayonnaise. It's important to note that these measurements are based on the original ratio of 1 pouch of tuna to 26 oz (737g) of mayonnaise. If you prefer a different ratio of tuna to mayonnaise, the amounts needed for a double batch may be different.

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The correct confidence interval for a population mean at a 98% confidence level is approximately (94.685, 121.569). Therefore, the correct choice is (94.725, 121.529).

To construct a confidence interval for a population mean, we can use the formula:

Confidence Interval = sample mean ± (critical value * standard error)

First, we need to determine the critical value for a 98% confidence level. Since the sample size is large (n = 28), we can use the z-table to find the critical value. For a 98% confidence level, the critical value is approximately 2.33.

Next, we calculate the standard error using the formula:

Standard Error = sample standard deviation / √(sample size)

In this case, the sample standard deviation is 30.4888 and the sample size is 28. Therefore:

Standard Error = 30.4888 / √(28) ≈ 5.769

Now we can construct the confidence interval:

Confidence Interval = 108.127 ± (2.33 * 5.769) = (108.127 ± 13.442) = (94.685, 121.569)

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Answer:

0.714

Step-by-step explanation:

5/7

(5X100) / 7 = 500/7.

50/7 = 7 remainder 1. carry that one over and place it before last zero in 500.

10/7 = 1 remainder 3.

we have 71 remainder 3.

3/7: 300/7 = 42.83

we now have answer of 0.714282

= 0.714 to nearest thousandth

False. The formula PV - FV(1 + n) does not determine the present value of $1.

But rather it is a formula used to calculate the present value of a future cash flow or investment. PV stands for present value, FV stands for future value, and n represents the number of periods for which the investment will be held. The formula states that the present value of an investment or cash flow is equal to the future value of that investment or cash flow, discounted at a specified rate of return over a specific period of time.

In other words, the formula is used to determine the value today of a future cash flow or investment based on the time value of money. By discounting the future value of the cash flow or investment at a specified rate, the formula calculates the present value that would be equivalent to receiving that cash flow or investment at a future date.

Therefore, the correct statement would be: The formula PV - FV(1 + n) is used to determine the present value of a future cash flow or investment.

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The most reasonable conclusion is that the instruction to brake smoothly resulted in a decrease in gas consumption, as evidenced by the lower mean and negative difference in means between the two groups.

Based on the information provided, the most reasonable conclusion would be that the instruction given to the first group of drivers to brake smoothly when approaching a red light or stop sign resulted in a decrease in the mean gallons of gas used compared to the second group.

The justification for this conclusion is supported by the fact that the mean for the first group is 43.16 gallons of gas, which is lower than the mean for the second group, which is 54.63 gallons of gas. This indicates that the first group, who received the specific instruction to brake smoothly, consumed less gas on average.

The histogram displaying the differences in means after the data for both groups were combined and redistributed also supports the conclusion. It likely shows a distribution that is centered around a negative value, indicating that the majority of the redistributed groups had a lower mean gas consumption compared to the initial second group.

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The product of [tex]\sqrt{30}[/tex] and [tex]\sqrt{10}[/tex] is 10[tex]\sqrt{3}[/tex].

The correct answer would be 10[tex]\sqrt{3}[/tex].

To find the product of [tex]\sqrt{30}[/tex] and [tex]\sqrt{10\\}[/tex], we can simplify it by multiplying the square roots and simplifying the result.

[tex]\sqrt{30 * 10 = (30 * 10) = 300}[/tex]

Now, let's simplify [tex]\sqrt{300}[/tex]. To do this, we can find the prime factorization of 300:

[tex]300 = 2 * 2 * 3 * 5 * 5 = 2^2 * 3 * 5^2[/tex]

Taking the square root of 300:

[tex]\sqrt{300}[/tex] = ([tex]\sqrt{(2^2 * 3 * 5^2)}[/tex]

Using the properties of square roots, we can split the square root into separate square roots:

[tex]\sqrt{300}[/tex] = [tex]\sqrt{2^2}[/tex] * [tex]\sqrt{3}[/tex] * [tex]\sqrt{5^2 }[/tex]

Simplifying each square root separately:

[tex]\sqrt{2^2}[/tex] = 2

[tex]\sqrt{3[/tex] = [tex]\sqrt{3[/tex]

[tex]\sqrt{5^2 }[/tex]= 5

Combining the simplified square roots:

[tex]\sqrt{300}[/tex] = 2[tex]\sqrt{3}[/tex] * 5 = 10[tex]\sqrt{3}[/tex]

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Therefore, the value of derivatives dy/dx = -3 tan t/2 and d2y/dx2 = -3(1 - cos t)/(2(1+cos t)^2).

To find dy/dx and d2y/dx2, we need to first express y in terms of x:

x = 2 sin t --> sin t = x/2 --> cos t = ±sqrt(1 - sin^2 t) = ±sqrt(1 - x^2/4)

y = 3 cos t = ±3sqrt(1 - x^2/4)

Since 0 < t < 2π, we can determine the sign of cos t by looking at the quadrant that x lies in. Since x = 2 sin t, we have x > 0 when 0 < t < π and x < 0 when π < t < 2π. Therefore, when 0 < t < π, we have:

cos t = sqrt(1 - sin^2 t) = sqrt(1 - x^2/4)

y = 3 sqrt(1 - x^2/4)

dy/dx = -3x/2 sqrt(1 - x^2/4)^(-1)

Taking the derivative of dy/dx with respect to x, we get:

d2y/dx2 = -3/2 [sqrt(1 - x^2/4)^(-1) - 3x^2/8 (1 - x^2/4)^(-3/2)]

Plugging in x = 2 sin t and simplifying, we get:

dy/dx = -3 sin t / sqrt(4 - 4 sin^2 t) = -3 sin t / 2 cos t = -3 tan t/2

d2y/dx2 = -3/4 (sec^2 t/2 - 3 tan^2 t/2) = -3/4 [(2/(1+cos t) - 3 tan^2 t/2)]

Using the identity cos^2(t/2) = (1+cos t)/2 and simplifying, we get:

d2y/dx2 = -3/4 [(4/(1+cos t) - 3) / (1+cos t)] = -3(1 - cos t)/(2(1+cos t)^2)

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It will take all three pumps, Working together, 1.56 minutes to fill the pool.

The given information, we can write three equations as follows:

1) (1/A + 1/B)*35 = C  ---(Equation 1)

2) (1/B + 1/C)*40 = C  ---(Equation 2)

3) (1/A + 1/C)*56 = C  ---(Equation 3)

We want  how many minutes it will take all three pumps, working together, to fill the pool, so let's represent the time taken by all three pumps working together as "t".

When all three pumps work together, they can fill the pool in one minute, so their combined rate is 1/C.

Using the rate formula, we can write the following equation:

1/A + 1/B + 1/C = 1/t   ---(Equation 4)

We have four unknowns (A, B, C, and t), so we need to solve for one of them to get the answer. Let's solve for "t".

First, we can simplify Equations 1, 2, and 3 as follows:

1) 1/A + 1/B = C/35

2) 1/B + 1/C = C/40

3) 1/A + 1/C = C/56

Next, we can substitute these equations into Equation 4 to get:

(C/35) + (C/40) + (C/56) = 1/t

Now, we can simplify and solve for "t":

LCD = 39200

1120C + 980C + 700C = 39200

2800C = 39200

C = 14

Substituting this value of "C" into any of the simplified equations, we can solve for "A" and "B". Let's use Equation 1:

1/A + 1/B = 14/35

5(A+B) = 98

A+B = 19.6

Now we can use A+B+C = 1/t to solve for "t":

t = 1 / (A+B+C) = 1 / (19.6 + 14) = 0.026 hours = 1.56 minutes

Therefore, it will take all three pumps, working together, 1.56 minutes to fill the pool.

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The calculated area of the middle shape is 18 square units

From the question, we have the following parameters that can be used in our computation:

The figures

From the figure, we have the middle shape to be a rectangle

The width of the rectangle is

Width = 6

The length of the rectangle is calculated as follows

15 = 3 * 5

27 = 3 * 3 * 3

The common factor is 3

So, we have

Length = 3

The area of the rectangle is calculated as

Area = Length * Width

So, we have

Area = 3 * 6

Evaluate

Area = 18

Hence, the area of the middle shape is 18 square units

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The annual interest rate, r, is 0.1 or 10%. A 10% annual interest rate resulted in the investment growing from $5,000 to $6,050 in 2 years.

To find the annual interest rate, r, we can rearrange the compound interest formula A = P(1 + r) and solve for r.

Given that an investment of $5,000 grows to $6,050 in 2 years, we can substitute these values into the formula:

$6,050 = $5,000

[tex] {1 + r}^{2}[/tex]

Dividing both sides by $5,000, we have:

1.21 =

[tex](1 + r)^2[/tex]

Taking the square root of both sides, we get:

√1.21 = 1 + r

Simplifying, we have:

1.1 - 1 = r

0.1 = r

This means that the investment grew by 10% annually over the 2-year period. Compound interest is calculated by adding the interest earned to the initial amount, and as time passes, the interest is earned on both the initial amount and the accumulated interest from previous periods. In this case, a 10% annual interest rate resulted in the investment growing from $5,000 to $6,050 in 2 years.

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The value of number of columns in which they can march is, 8

According to the problem ,

Members in army contingent = 1000

And, Members in army band = 56

Hence, To find maximum number of columns to march behind army band in the same number of columns,

we have to find HCF of 1000 and 56

1000 = 56 × 17 + 48

56 = 48 × 1 + 8

48 = 8 × 6 + 0

Here, Remainder has become zero.

Since, the divisor in this is, 8 .

HCF ( 1000 , 56 ) = 8

Thus, Required columns = HCF ( 1000 , 56 ) = 8

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The calculated value of the exponential decay factor is 1/5

From the question, we have the following parameters that can be used in our computation:

The table of values

From the table of values, we can see that

x            f(x)

1             625

2             125

3             25

This show that as x increases by 1, the function f(x) values decreases by a constant factor

This means that

The function is a decay function and the rate of decay is calculated as

Rate = 125/625

Evaluate

Rate = 1/5

Hence, the exponential decay factor is 1/5

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The area of the triangle with base 2x and height (x - 7) in simplified form is x² - 7x

Area of a triangle = ½ × base × height

Base = 2x

Height = (x - 7)

Area of a triangle = ½ × base × height

= ½ × 2x × (x - 7)

= (2x² - 14x) / 2

= x² - 7x

Hence, the triangle given the dimensions has an area of x² - 7x

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Answer:

Ava lives 8/5 or 1 3/5 miles further from the school compared to Jayna.

Step-by-step explanation:

The amount of fluid in container B is 9.5 ounces.

to separate into two or more parts or pieces. : to separate into classes or categories. : cleave entry 2, part.

To determine the amount of fluid in container B, we can divide the amount of fluid in container A by the given ratio of 8. Since container A contains 76 ounces, we divide 76 by 8 to find that each unit of the ratio represents 9.5 ounces. Therefore, container B would contain 9.5 ounces of fluid.

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The p-value of the test is approximately 0.299.

To find the p-value of the test, we need to conduct a hypothesis test. Let's set up the hypotheses first:

Null Hypothesis (H0): The modification of the process did not reduce the number of flaws per pair of shoes.

Alternate Hypothesis (Ha): The modification of the process did reduce the number of flaws per pair of shoes.

We can use a one-sample t-test to analyze the data. The test statistic can be calculated using the formula:

t = ( - μ) / (s / √n),

where  is the sample mean, μ is the population mean (2.5 flaws), s is the sample standard deviation (0.66), and n is the sample size (30).

Substituting the values into the formula, we get:

t = (2.2 - 2.5) / (0.66 / √30) ≈ -1.054

To find the p-value associated with this test statistic, we need to consult the t-distribution table or use statistical software. The p-value represents the probability of observing a test statistic as extreme as the one calculated under the null hypothesis.

Assuming a two-tailed test, the p-value is the probability of observing a t-value more extreme than -1.054 or more extreme than 1.054. Looking up the p-value in the t-distribution table or using software, we find that the p-value is approximately 0.299.

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The number of bacteria that were present when the antibiotic was first introduced is 14

From the question, we have the following parameters that can be used in our computation:

The graph (see attachment)

The number of bacteria that were present when the antibiotic was first introduced is when the graph intersects with the y-axis

In this case, the graph intersects with the y-axis at

y = 14

Hence, the number of bacteria that were present when the antibiotic was first introduced is 14

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Complete question

Biologists introduced a population of bacteria to a test environment. The function f models the population size (in thousands) as a function of time (in days) after introduction.

The graph shows a bacteria population (see attacment)

How many bacteria were present when the antibiotic was first introduced?

The triangle similar to ΔABC is ΔSTU, in which m∠S = 87° and m∠U = 70°. Option C

We have,

A triangle is a polygon with three edges and three vertices. It is one of the basic shapes in geometry. A triangle with vertices A, B, and C is denoted \triangle ABC. In Euclidean geometry, any three points, when non-collinear, determine a unique triangle and simultaneously, a unique plane.

here, we have,

In ΔABC, we know that m∠A = 87° and m∠B = 23°.

The angle m∠C must therefore be 70°,

since the sum of the angles in a triangle is always 180°.

now, we have,

In ΔSTU, we are given that m∠S = 87°, which corresponds to ∠A in ΔABC.

We are also given that m∠U = 70°, which corresponds to ∠C in ΔABC.

so, we get,

as, This is because two triangles are similar if their corresponding angles are congruent.

Therefore, ΔSTU is similar to ΔABC.

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The above answer is in response to the full question below

In Δ ABC, m∠A = 87° and m∠B = 23°.

Select the triangle that is similar to ΔABC.

A. ΔXYZ, in which m∠X= 87° and m∠z = 50°

B. ΔLMN, in which m∠M=20° and m∠N=87°

C. ΔSTU, in which m∠s = 87° and m∠U=70°

D. ΔPQR, in which m∠P= 110° and m∠R = 23°

It is possible that the question or problem described could be investigated using a mathematical population model. A population model is a mathematical representation of a population, which can be used to make predictions about the population’s behavior and characteristics.

The usefulness of such a model would depend on the specific question or problem at hand. If the question involves understanding how a population will grow or change over time, a mathematical model could be very helpful. However, if the question is more complex and involves multiple factors or variables, a mathematical model may not be sufficient on its own.

For example, if the question is about predicting the spread of a disease in a population, a mathematical model that takes into account the size of the population, the infectiousness of the disease, and the effectiveness of various interventions could be very useful. On the other hand, if the question is about understanding the motivations and behavior of individuals within a population, a mathematical model may not be the best approach. In this case, other methods such as surveys or interviews may be more appropriate.

In summary, whether or not a mathematical population model is appropriate for investigating a question or problem depends on the specific details of that question or problem. In some cases, a population model can provide valuable insights and predictions, while in other cases it may not be sufficient on its own.

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The probability of selecting exactly two mid-sized cars and four compact cars out of a total of six cars is approximately 11.56%.

The answer to this question involves using the formula for combinations and multiplying the probabilities of each selected car.

Calculate the number of ways to select two mid-sized cars and four compact cars.
- Choose 2 mid-sized cars from 10: C(10, 2) = 10! / (2! * (10 - 2)!) = 45 ways
- Choose 4 compact cars from 15: C(15, 4) = 15! / (4! * (15 - 4)!) = 1365 ways

There are a total of 25 cars to choose from and we need to select 2 mid-sized cars from the 10 available and 4 compact cars from the 15 available. Using the formula for combinations, we get:

C(10,2) * C(15,4) = 45 * 1365 = 61,425

This represents the number of ways we can select exactly 2 mid-sized cars and 4 compact cars. To find the probability, we divide this number by the total number of possible selections:

C(25,6) = 53,130

So the probability of selecting exactly 2 mid-sized cars and 4 compact cars is:

61,425 / 53,130 ≈ 0.1156 or 11.56%

In conclusion, the probability of selecting exactly two mid-sized cars and four compact cars out of a total of six cars is approximately 11.56%.

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Answer:

-------------------

There are 6 sides on each cube, so there are a total of 6 x 6 = 36 possible outcomes.

The combinations that result in a sum greater than 9 are:

There are 6 favorable outcomes.

Therefore, the probability of two numbers whose sum is greater than 9 is:

Answer: 39

Step-by-step explanation: 180-141= 39