SOLUTION: According to one​ poll, 45​% of households in a certain region still had landline phone service. Suppose a random sample of 50 households from the region is taken. Complete par

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Question 1175347: According to one​ poll, 45​% of households in a certain region still had landline phone service. Suppose a random sample of 50 households from the region is taken. Complete parts​ (a) through​ (d) below. a. Find the probability that exactly 20 of the households sampled still have a landline.
Answer by ewatrrr(24785)   (Show Source): You can put this solution on YOUR website!

Hi
 p-hat = 20/50 = .40

   z =  = -.7107
 P(z ≤ -.7107)= .2386
Wish You the Best in your Studies.


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