Question

Assume that when adults with smartphones are randomly​ selected, 46​% use them in meetings or classes. If 25 adult smartphone users are randomly​ selected, find the probability that exactly 16 of them use their smartphones in meetings or classes.

The probability is

Answer 1

Let , Be the number of adults who use their smartphones in meetings or classes.

Here , X has binomial distribution with parameter n=25 and p=46%=0.46

The probability mass function of X is ,

; x=0,1,2,........,n and q=1-p

= 0 ; otherwise

Now ,

Therefore , the probability that exactly 16 of them use their smartphones in meetings or classes is 0.0321