Waiting2 Cars arrive at the drivethrough window of the post ofce at a rate of 4 every 19 minutes. The average service time is 2 minutes. The Poisson distribution is appropriate for the arrival rate and service times are exponentially distributed. a] What is the average time a car is in the system? b] What is the average number of cars in the system? c] What is the average number of cars waiting to receive service? [i] What is the average time a car is in the queue? e) What is the probability that there are no cars at the window? f] What percentage of the time is the postal clerk busy? g] What is the probability that there are exactly 2 cars in the system