Question

The Pew Research Center has found that 86% of people 18 through 29 years old are social media users.

What is the probability that you have to ask 10 people in this age group to find one that is not a social media user?

What is the probability that you have to ask 20 people in this age group to find one that is not a social media user?

What is the probability you must ask at most 5 people in this age group to find one that is not a social media user?

Answer 1

prob(user) = .86
prob(not user) = .14

prob(of 10, 1 is not a user)
= C(10,1)(.14)^1 (.86)^9 = appr .36

do the others in the same way