Question: The mailing list of an agency hat markets scuba-driving trips to the Florida Keys contains 70% males and 30% females. The agency calls 30 people chosen at random from its list.

a. What is the probability that 20 of the 30 are men? (Use the binomial probability formula.)

b. What is the probability that the first woman is reached on the fourth call? (That is, the first 4 calls give MMMF.)