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3 years ago

Math, yes I don't know if I got it right

Mathematics

2 answers:

olga nikolaevna [1]3 years ago

8 0

Answer:

4*(n)^2

Step-by-step explanation:

yaroslaw [1]3 years ago

5 0

Answer:

3 is the unknow number and the equation is 2+(4*x)=14

Step-by-step explanation:

2+(4*x)=14

2-2)+(4*x)=14 (-2) (subtract both sides)

4x=12

4x=12 (divide both sides)

4 4

x=3

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1,153

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3 years ago

Someone help me ASAP!!! It’s a timed quiz

Aloiza [94]

Answer:

n=28

Step-by-step explanation:

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3 years ago

t is known that the population variance equals 484. With a 0.95 probability, the sample size that needs to be taken if the desir

PtichkaEL [24]

Answer:

The sample size needed to be taken is approximately 74.

Step-by-step explanation:

To get alpha; we have 1 - 0.95 = 0.05

Therefore, $z_{\frac{a}{2} } = \frac{0.05}{2} = 0.025$

The we look up z* in a Standard Normal table where α = 0.025 area in each tail.

From the table, z* = 1.96

From the question variance is 484, then the standard deviation is 22

Standard deviation = $\sqrt{Var(x)} = \sqrt{484} = 22$

And margin of error is 5 or less

The formula for margin of error is given as:

margin of error = $\frac{(z^{*}) (SD)}{\sqrt{n} }$

$5 = \frac{1.96 * 22}{\sqrt{n} } \\5 = \frac{43.12}{\sqrt{n} } \\5 * \sqrt{n} = 43.12\\(5)^{2} * (\sqrt{n} )^{2} = (43.12)^2\\25 * n = 1859.3344\\25n = 1859.3344\\\frac{25n}{25} = \frac{1859.3344}{25} \\n = 74.373376\\n = 74$

The approximate value of n is 74.

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3 years ago

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Answer:

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Step-by-step explanation:

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