Keua Park Savings and Loan currently has one drive-in teller window. Cars arrive at a mean rate ...

  

Keua Park Savings and Loan currently has one drive-in teller window. Cars arrive at a mean rate of 10 per hour. The mean service rate is 12 cars per hour.

a. What is the probability that the service facility will be idle?

b. If you were to drive up to the facility, how many cars would you expect to see waiting and being served?

c. What is the average time waiting for service?

d. What is the probability an arriving car will have to wait?