6. Assume that the bank in problem 4 has room in its drive for only 5 cars (including the one being served) and that arrivals who appear will not wait if the drive is full.

a. Find Po.

b. Compare this with Pp computed above for the situation in which there is sufficient room that no customers are turned away.

c. Compute the probability that the queue will be full.

d. How many customers per hour will be turned away from the drive-in window?