Practice 1: The following probability model shows the distribution for the number of rooms in US housing units. Rooms Probability One 0.005 Two 0.011 Three 0.08S Four 0.183 Five 0.230 Six 0.204 Seven 0.123 Eight or more 0.156 Source. US Census Bureau (a) Verify that this is a probability model. (b) What is the probability that a randomly selected housing unit has 4 or more rooms? (c) What is the probability that a randomly selected unit has fewer than 8 rooms? (d) What is the probability that a randomly selected housing unit has four to six (inclusive) rooms? (e) What is the probability that a randomly selected housing unit has at least two rooms