4. The following data represents the number of rooms in a random sample of U.S. housing units. Frequency Rooms One TWO Three 88 Four Five Six Seven Eight or more 183 230 204 123 156 (a) What is the probability that a randomly selected housing unit has four or more rooms? (b) What is the probability that a randomly selected housing unit has fewer than eight rooms? (c) What is the probability that a randomly selected housing unit has from four to six (inclusive) rooms? (d) What is the probability that a randomly selected housing unit has at least two rooms? 5. Among 21- to 25-year-olds, 29% say they have driven while under the influence of alcohol. Suppose that three 21- to 25-year-olds are selected at random. (a) What is the probability that all three have driven while under the influence of alcohol? (bWhat is the probability that at least one has not driven while under the influence of alcohol c) What is the probability that none of the three has driven while under the influence of alcohol