Chapter 4.3, Problem 23E

Using a Distribution to Find Probabilities In Exercises 11–26, find the indicated probabilities using the geometric distribution, the Poisson distribution, or the binomial distribution. Then determine whether the events are unusual. If convenient, use a table or technology to find the probabilities.

23. Paying for College Education Sixty-eight percent of parents of children ages 8–14 say they are willing to get a second or part-time job to pay for their children’s college eduction. You randomly select five parents. Find the probability that the number of parents who say they are willing to get a second or part-time job to pay for their children’s college eduction is (a) exactly three, (b) less than four, and (c) at least three. (Source： T. Rowe Price Group, Inc.)