Question

Assume that when adults with smartphones are randomly​ selected,43​% use them in meetings or classes. If 30 adult smartphone users are randomly​ selected, find the probability that exactly 20 of them use their smartphones in meetings or classes.

Answer 1

Answer:

Given,

n = 30

p = 43%

= 0.43

To determine the probability that exactly 20 of them use their smartphones in meetings or classes

Here we use binomial distribution

P(X = 20) = 30C20*0.43^20*0.57^(30-20)

= 30045015*0.43^20*0.57^10

= 0.0051

Hence the probability that exactly 20 of them use their smartphones in meetings or classes is 0.0051.