Exhibit 13.1 The Following Questions Are Based on the Output Below

Multiple Choice

Exhibit 13.1
The following questions are based on the output below.
A store currently operates its service system with 1 operator. Arrivals follow a Poisson distribution and service times are exponentially distributed. The following spreadsheet has been developed for the system.
-A company has recorded the following list of service rates (customers/hour) for one of its servers. What is the mean service time for this server? ​
Customers / hour: 4, 4, 5, 6, 5, 4, 3, 4, 3, 5, 5, 6
​

A) 0.22 min
B) 1.11 min
C) 4.5 min
D) 13.3 min