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Assume customers arrive at the average rate of 12 people per hour. There is one employee...

Assume customers arrive at the average rate of 12 people per hour. There is one employee who can server one customer every 3 minutes on average. Assume that there is a variation in the demand and in the supply.Arrival time has a standard deviation of 1 min , and a standard deviation of 2 minutes for the service

What is the average no. of customers in system (Ls) ?

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