Exhibit 13-1
a Grocery Store Manager Would Like to Use $\lambda$

Essay

Exhibit 13-1
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 13-1.Again assuming an exponential distribution with the parameter $\lambda$ 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?