18). Starting at 9 : 00am, assengers arrive at a train station as a Poisson process with rate A = 2 per minute. The next train will depart at time T, where T is uniformly distributed between 9 : 10am and 9 : 15am. Compute the mean waiting time for a passenger at the station before the train departs. [Hint: condition on T and N(T), the number of passengers who depart on the train]. I Answer: 6 mins 15 sec