For each of the following statements regarding service times modeled by the exponential distribution, label the statement as true or false and then justify your answer by referring to specific statements in the chapter.
(a) The expected value and variance of the service times are always equal.
(b) The exponential distribution always provides a good approximation of the actual service-time distribution when each customer requires the same service operations.
(c) At an s-server facility, s > 1, with exactly s customers already in the system, a new arrival would have an expected waiting time before entering service of 1/ μ time units, where μ is the mean service rate for each busy server.