8,9,10

1 The credit union is now considering adding a third teller (in the form of an M/M/3) with the goal of solving the following argument: arg min $158 + $11E (LQ) BE{2,3) Recall the term "arg min" or "argument of the minima" gives the solution s such that the function (8) = $158 + $11E (L) attains its minimum value. Before solving this problem, what is the utilization p for 8 = 3? (Hint: remember that and u were given in the opening scenario.) Time left 1:24:17 Using your answer to the above question, determine the total cost f(3) = $15s + $11E [L] = 3 for s = a $54.35 b. $67.33 C. $56.22 d. $45.77 What is the optimal number of tellers to staff, s*? (Hint: you know the total cost of s = 3 from the above problem; to calculate s = 2 you can simply use the corresponding EL,) for Scenario 2 presented in the table.) = a. s* = 3 tellers b=2 tellers Considering what is the average number of customers in the system, E[L]? a 1.37 customers b: 2.51 customers C.3.01 customers d 107 customers