Fifty-seven percent of U.S. adults favor using nuclear energy as a source of electricity in the United States. You randomly select eight U.S. adults. Find the probability the number of U.S. adults who favor using nuclear energy as a source of electricity in the United States is
(a) Exactly four,
(b) Less than five,
(c) At least three.
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.