Assume that when adults with smart phones are randomly selected 45% use them in meetings or classes if 30 adult smart phone users are randomly selected find the probability that exactly 20 of them use their smart phones in meetings or classes
I think it is 2/3 because 20 is the probability and 30 are the users. So basically, it is the probability over the total in this case 30. 20/30=2/3. Hope it helps?
