Question

Assume that when adults with smartphones are randomly selected, 44 % use them in meetings or classes. If 14 adult smartphone users are randomly selected, find the probability that exactly 5 of them use their smartphones in meetings or classes.

Answer 1

Solution:

Given:  when adults with smartphones are randomly selected, 44 % use them in meetings or classes.

thus p = probability of adults with smartphones use them in meetings or classes = 0.44

n = Number of adult smartphone users = 14

X = Number of adults with smartphones use them in meetings or classes follows a binomial distribution with parameters n = 14 and p = 0.44

We have to find:

P(X = 5 ) = .........?

Binomial probability formula :

Where q = 1 – p = 1 - 0.44 = 0.56

thus

_{(Round final answer to specified number of decimal places)}