Exhibit 12-1 A Grocery Store Manager Would Like to Use an Analytical

Essay

Exhibit 12-1
A grocery store manager would like to use an analytical queueing model to study the lines of customers that form in front of the checkout stations in the store. During a period of time when business is steady, several store employees have gathered data on customer interarrival times, which are shown below.

-[Part 3] Refer to Exhibit 12-1.Again assuming an exponential distribution with the parameter λ you obtained in Part 2,what is the probability that a customer interarrival time will be more than 2 minutes,but less than 5 minutes