2. M.M. Sprout, a catalog mail-order retailer, has one customer service representative (CSR) to take orders at an 800 telephone number. If the CSR is busy, the next caller is put on hold. For simplicity, assume that any number of incoming calls can be put on hold and nobody hangs up in frustration over a long wait. Suppose that, on average, one call comes every 5 minutes and that it takes the CSR an average of 4 minutes to take an order. Both interarrival and activity times are exponentially distributed (i.e., they have coefficients of variation equal to 1). The
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