3 years ago

25 points answer it please Fast

Mathematics

1 answer:

Fiesta28 [93]3 years ago

4 0

I think D. is the answer.

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The weekly earnings of students in one age group are normally distributed with a standard deviation of 47 dollars. A researcher

ELEN [110]

Answer:

Option D) 340

Step-by-step explanation:

We are given the following in the question:

Alpha, α = 0.05

Population standard deviation, σ = $47

Margin of error = 5

95% Confidence Interval:

$\mu \pm z_{critical}\frac{\sigma}{\sqrt{n}}$

$\text{Margin of error} = z_{critical}\frac{\sigma}{\sqrt{n}}$

Putting the values, we get,

$z_{critical}\text{ at}~\alpha_{0.05} = 1.96$

$5 = 1.96(\dfrac{47}{\sqrt{n}} )\\\\\sqrt{n} = \dfrac{47\times 1.96}{5}\\\\n = 339.443776\\\Rightarrow n \approx 340$

Thus, the correct answer is

Option D) 340

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3 years ago

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inysia [295]

Answer:

= 1.6

Unless you meant to clarify what in the equation you needed, but that is the answer to it.

7 0

3 years ago

Find the missing number in this proportion.<br><br> 7 / 35 = ? / 28

Phantasy [73]

using proportional law 5.6

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3 years ago

3.<br> Find the measure of each angle. If 34 degrees is given below.

Anettt [7]

Answer:

a. 34

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Step-by-step explanation:

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Answer:

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Step-by-step explanation:

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