Question

Assume that when adults with smartphones are randomly selected, 39% use them in meetings or classes. If 8 adult smartphone users are randomly selected, find the probability that exactly 5 of them use their smartphones in meetings or classes.

Answer 1

This is a binomial distribution with n=8, p=0.39.

$P(X=5)=C_8^50.39^5(1-0.39)^{8-5}=0.1147.$