Assume that when adults with smartphones are randomly selected, 62% use them in meetings or classes. If 9 adult smartphone users are randomly selected, find the probability that exactly 5 of them use their smartphones in meetings or classes.
Solution
Given that ,
p = 0.62
1 - p = 1 - 0.62 = 0.38
n = 9
x = 5
Using binomial probability formula ,
P(X = x) = ((n! / x! (n - x)!) * px * (1 - p)n - x
P(X = 5) = ((9! / 5! (4)!) * 0.625 * (0.38)4
= 0.2407
Probability = 0.2404
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