Assume that when adults with smartphones are randomly selected, 44% use them in meetings or classes. If 7 adult smartphone users are randomly selected, find the probability that exactly 5 of them use their smartphones in meetings or classes.
The probability is
(round to four decimals places as needed.)
Solution
Given that ,
p = 0.44
1 - p = 1 - 0.44 = 0.56
n = 7
Using binomial probability formula ,
P(X = x) = (n C x) * px * (1 - p)n - x
P(X = 5) = (7 C 5) * (0.44)5 * (0.56)2
= 0.108607
Probability = 0.1086
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