=E11.25. Consider the M/M/s model with a mean arrival rate of 10 customers per hour and an expected service time of five minutes. Use the Excel template for this model to print out the various measures of performance (with t 10 and t 0, respectively, for the two waiting-time probabilities) when the number of servers is one, two, three, four, and five. Then, for each of the following possible criteria for a satisfactory level of service

(where the unit of time is one minute), use the printed results to determine how many servers are needed to satisfy this criterion.

a. Lq 0.25

b. L 0.9

c. Wq 0.1

d. W 6

e. P{ q 0} 0.01

f. P{ 10} 0.2 g.