Statistics - math

Question

Assume that when adults with smartphones are randomly​ selected,

56​%

use them in meetings or classes. If

11

adult smartphone users are randomly​ selected, find the probability that fewer than

5

of them use their smartphones in meetings or classes.

Answer 1

Let X= number of adult smartphone users who use them in meetings or classes.

X ~ Binomial (n=11, p=0.56)

Want P(X<5)= P(X ≤ 4)

Use some technology or use he binomial formula to calculate and this probability is

0.15678132246