Consider the M/G/1 model. (a) Compare the expected waiting time in the queue if the servicetime distribution

Question:

Consider the M/G/1 model.
(a) Compare the expected waiting time in the queue if the servicetime is (i) exponential, (ii) constant, (iii) Erlang with the amount of variation (i.e., the standard deviation) halfway between the constant and exponential cases.
(b) What is the effect on the expected waiting time in the queue and on the expected queue length if both λ and μ are doubled and the scale of the service-time is changed accordingly?
Distribution
The word "distribution" has several meanings in the financial world, most of them pertaining to the payment of assets from a fund, account, or individual security to an investor or beneficiary. Retirement account distributions are among the most...