At a fashion retailer, there are three cashiers providing checkout service simultaneously. On average, customers arrive

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At A Fashion Retailer There Are Three Cashiers Providing Checkout Service Simultaneously On Average Customers Arrive 1 (42.45 KiB) Viewed 68 times

At a fashion retailer, there are three cashiers providing checkout service simultaneously. On average, customers arrive at the checkout area every 6 minutes. It is estimated that the customer arrival process is a Poisson process. The average checkout time for each customer is 12 minutes, with its standard deviation equal to 18 minutes. Suppose that customers form a single line. What is the average waiting time in minutes for a customer? Note: 1. Keep 2 decimal places for your final answer. Either use Excel for your calculation, or keep at least 4 decimal places for your intermediate numbers. 2. The Poisson arrival process has exponentially distributed inter-arrival times.