=11.19. Consider the following statements about the M/G/1 queueing model, where 2 is the variance of service times. Label each statement as true or false, and then justify your answer.

a. Increasing 2 (with fixed and ) will increase Lq and L, but will not change Wq and W.

b. When the choice is between a tortoise (small and 2

) and a hare (large and 2

) to be the server, the tortoise always wins by providing a smaller Lq.

c. With and fixed, the value of Lq with an exponential service-time distribution is twice as large as with constant service times.