Question

Assume that when adults with smartphones are randomly​ selected, 45​% use them in meetings or classes. If 30 adult smartphone users are randomly​ selected, find the probability that exactly 24 of them use their smartphones in meetings or classes.

Answer 1

P(X=12)

Step-by-step explanation:

The probability of adults using smartphones during meetings or classes,

p = 0.44

The Sample size of adult smartphone users,

n = 15

The required probability is p(x=12)

The probability mass function of the binomial distribution is defined as p(x=12) (nx)px(1−p)n−x, x=0,1,2,…,n

By using the binomial probability distribution to compute the (15-12)!×12!