Melanie realizes that how long the customer must wait is also very important. She is also concerned about customers balking when the waiting line is too long. Using the arrival and service rates in Problem 1, she wants you to calculate the following system characteristics:

(a) The average time a customer spends in the system
(b) The average time a customer spends waiting in line
(c) The probability of having more than three customers in the system
(d) The probability of having more than four customers in the system