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A tool crib has exponential interarrival time and service time, and it serves a very large group of mechanics.

A tool crib has exponential interarrival time and service time, and it serves a very large group of mechanics. The mean time between arrivals is 4 minutes. It takes 3 minutes on the average for a tool crib attendant to service a mechanic. The attendant is paid ₹ 10 per hour and the mechanic is paid ₹ 15 per hour. Would it be advisable to have a second tool crib attendant?

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