You are a telemarketer selling service contracts for Macy's. He sold 20 in his last 100 calls (p = .20). If you call 12 people tonight, what is the probability of having no sales.

You are a telemarketer selling service contracts for Macy's. He sold 20 in his last 100 calls (p = .20). If you call 12 people tonight, what is the probability of at most having 2 sales?

A password to access a computer consists of a sequence of three

different vowels. If we select a sequence of three different vowels

at random, the probability of gaining access to the computer is: