Question

Assume that when adults with smartphones are randomly​ selected, 

44​% use them in meetings or classes. If 

6 adult smartphone users are randomly​ selected, find the probability that exactly 

4 of them use their smartphones in meetings or classes.

Answer 1

This is a binomial distribution with p=0.44, n=6.

$P(X=4)=C_6^40.44^4(1-0.44)^{6-4}=0.1763.$