Question 3 A chartered taxi normally makes eight (8) trips within an 8am - 12pm work day. He can typically make three (3) trips within an hour. Assuming that all his trips are independent of each other: What is the mean number of trips he makes in his work day? b) What is the probability that the taxi driver makes 9 trips for his work day? c) What type of random variable is this? Give reasons for your answer. d) Determine the probability that the time between his trips is 20 minutes. c) What is the average time between his trips? f) What type of random variable is this? Give reasons for your