Answer to Question #307716 in Statistics and Probability for Kim

Question

Assume that when adults with smartphones are randomly selected, 64% use them in meetings or classes. If 5 adult smartphone users are randomly selected, find the probability that exactly 3 of them use their smartphone in meetings or classes.

Answer 1

This is a binomial distribution with p=0.64, n=5.

$P(X=3)=C_5^30.64^3(1-0.64)^2=0.2038.$