probability

Problem #4 (20 points) - A Queueing Process Customers arrive in a small store as a Poisson process at a rate of 18 per hour. There are two servers each working at a rate of 9 customers per hour in accordance with exponential service times. The store capacity is 7 customers at any given time. Determine in the long term, a.) (5 points) the average number of customers waiting in line. b.) (5 points) the average waiting time (in minutes) per customer, c.) (5 points) the average time (in minutes) spent in the store per customer, and d.) (5 points) the average number of customers in the store