find the probability

Question

Assume that when adults with smartphones are randomly​ selected, 49% use them in meetings or classes. If 25 adult smartphone users are randomly​ selected, find the probability that exactly 15 of them use their smartphones in meetings or classes.

Answer 1

Use binomial distribution formula, where p (probability of success, where success is adult using smart phone in meeting) = 0.49, n (sample size) = 25 and x (number of successes) = 15

P(x = 15) = 25! (0.49)^15 (0,51)^10

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15! 10!