I need E through H only

Automobiles arrive at the drive-through window at the downtown Fort McMurray post office at the rate of 3 every 10 minutes. The average service time is 1.5 minutes. The Poisson distribution is appropriate for the arrival rate and service times are exponentially distributed a) The average time a car is in the system is 2.73 minutes (round your response to two decimal places). b) The average number of cars in the system is 0.82 cars (round your response to two decimal places). c) The average number of cars waiting to receive service is 0.37 cars (round your response to two decimal places). d) The average time a car is in the queue is 1.23 minutes (round your response to two decimal places). e) The probability that there are no cars at the window is (round your response to two decimal places). f) The percentage of the time the postal clerk is busy is % (round your response to the nearest whole number). 9) The probability that there are exactly 2 cars in the system is (round your response to three decimal places). h) If a second drive-through window, with its own server, were added, the average time a car is in the system is minutes (round your response to two decimal places)