Assume that when adults with smartphones are randomly selected, 56 % use them in meetings or classes. If 9 adult smartphone users are randomly selected, find the probability that at least 4 of them use their smartphones in meetings or classes what is the probability?

-2 is the right

c.

step-by-step explanation:

because first you have to add the 4x, 9x, and the 7x together and you get 20x and then you add the last numbers up and you get 5and then you put the subtraction sign in there and that's how you get the answer.

part a: 1.08

part b: 27.59