Question: A small call center, staffed by only one operator (server), has 30 customers calling every hour with a standard deviation of inter-arrival times of 2

A small call center, staffed by only one operator (server), has 30 customers calling every hour with a standard deviation of inter-arrival times of 2 minutes. (This results in c_a^2 = 1.) The activity time for a call center operator to process each call (by addressing the callers queries) is, on average, 1.5 minutes with a standard deviation of 4 minutes, primarily because of the wide variety of caller queries. What is the average time (in minutes) that a caller has to wait in line before getting served by the call center operator?

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