Assume that when adults with smartphones are randomly selected, 58% use them in meetings or classes. If 13 adult smartphone users are randomly selected, find the probability that fewer than 4 of them use their smartphones in meetings or classes.

The u-drive rent-a-truck company plans to spend $13 million on 320 new vehicles. each commercial van will cost $25 comma 000, each small truck $50 comma 000, and each large truck  $80 comma 000. past experience shows that they need twice as many vans as small trucks. how many of each type of vehicle can they buy?