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iragen [17]
3 years ago
12

What is the value of p +9 when p=13.

Mathematics
1 answer:
notka56 [123]3 years ago
7 0

Answer:

p=13

hence 13+9=22

Step-by-step explanation:

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It is known that the population variance equals 484. With a .95 probability, the sample size that needs to be taken to estimate
Hitman42 [59]

Answer:

The minimum sample size is n = 75 so that the desired margin of error is 5 or less.                          

Step-by-step explanation:

We are given the following in the question:

Population variance = 484

Standard deviation =

\sigma^2 = 484\\\sigma =\sqrt{484} = 22

Confidence level = 0.95

Significance level = 0.05

Margin of error = 5

Formula:

Margin of error =

E = z\times \dfrac{\sigma}{\sqrt{n}}\\\\n = (\dfrac{z\times \sigma}{E})^2

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

Putting values, we get

E\leq 5\\\\1.96\times \dfrac{22}{\sqrt{n}} \leq 5\\\\\sqrt{n} \geq 1.96\times \dfrac{22}{5}\\\\n \geq (1.96\times \dfrac{22}{5})^2\\\\n \geq 74.373

Thus, the minimum sample size is n = 75 so that the desired margin of error is 5 or less.

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3 years ago
What is the area of a traingle with base as 2cm and height as 7cm?
Alex17521 [72]

Answer:

7 cm²

Step-by-step explanation:

Area of a triangle = (Base * hight)  / 2

A = (2* 7) /2 = 14/ 2 = 7 cm²

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Step-by-step explanation:

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X= 2/5

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