Assume that when adults with smartphones are randomly selected, 57% use them in meetings or classes. if 30 adult smartphone users are randomly selected, find the probability that exactly 23 of them use their smartphones in meetings or classes.

The probability that randomly selected adult uses smartphone in meetings is p=0.57 and the probability that randomly selected adult doesn't use smartphone in meetings is q=1-p=1-0.57=0.43.

The probability that exactly 23 of 30 use their smartphones in meetings is

50 min

step-by-step explanation:

they will be decreasing both their times in half

60 / 2 = 30

40/2 = 20

30 + 20 = 50