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3 years ago

Please help with this ill mark brainlyess answer if its right

Mathematics

2 answers:

geniusboy [140]3 years ago

4 0

30 is 20% of 150.

30/x = 20/100

30 * 100 = 20 * x

(30 * 100)/20 = x

x = 150

Aleks04 [339]3 years ago

4 0

I think your answer is

150

Glad I could help, and good luck!

AnonymousGiantsFan

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We know that n = 50 and p =0.78.

We need to check the conditions in order to use the normal approximation.

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Step-by-step explanation:

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Solution to the problem

We know that n = 50 and p =0.78.

We need to check the conditions in order to use the normal approximation.

$np=50*0.78=39 \geq 10$

$n(1-p)=50*(1-0.78)=11 \geq 10$

Since both conditions are satisfied we can use the normal approximation and the distribution for the proportion is given by:

$p \sim N (p, \sqrt{\frac{p(1-p)}{n}})$

With the following parameters:

$\mu_ p = 0.78$

$\sigma_p = \sqrt{\frac{0.78*(1-0.78)}{50}}= 0.0586$

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