Just need help with H. This is my third time posting this question to Chegg and all "Expert Answers" have been wrong so far. Please help me answer this question using an M/M/s queuing model. Thanks!

Steps outlined to answer H, using the M/M/s queuing model:

1. Find the probability that there are zero cars in the system

2. Find the average number of cars in the system

3. Finally, find the average time in the system.

Automobiles arrive at the drive-through window at the downtown Baton Rouge, Louisiana, post office at the rate of 2 every 10 minutes. The average service time is 1.5 minutes. The Poisson distribution is appropriate for the arrival rate and service times are negative exponentially distributed. a) The average time a car is in the system = minutes (round your response to two decimal places). b) The average number of cars in the system = cars (round your response to two decimal places). c) The average number of cars waiting to receive service = cars (round your response to two decimal places). d) The average time a car is in the queue = minutes (round your response to two decimal places). e) The probability that there are no cars at the window = (round your response to two decimal places). f) The percentage of the time the postal clerk is busy =% (round your response to the nearest whole number). g) The probability that there are exactly 2 cars in the system = (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 = minutes (round your response to two decimal places)