Assume that when adults with smartphones are randomly selected, 39% use them in meetings or classes. If 9 adult smartphone users are randomly selected, find the probability that exactly 7 of them use their smartphones in meetings or classes
Probability of being used is 0.39.
Probability of not being used is 0.61.
You want exactly 7 of 9.
9C7 · 0.397 · 0.612 = your answer
