Also the behavior of queues is surprising. Average wait time does not tell you much about the distribution of wait time, and is an extremely nonlinear function

Also the behavior of queues is surprising. Average wait time does not tell you much about the distribution of wait time, and is an extremely nonlinear function of the number of queues. https://en.wikipedia.org/wiki/Queueing_theory https://en.wikipedia.org/wiki/Queueing_theory