The manager of Champion Cooling Company has recently implemented a statistical process

control method. The accompanying table shows the results of several different samples of walk$-$in

coolers that were produced in the previous month.

For your reference, the $A_2$ value for determining the three$-$sigma control limits is given below:

a$)$ What is the value of the center line for the chart that monitors performance? $[5$ pts$]$

b$)$ What is the value of the upper control limit and lower control limit$?[8$ pts$]$

c$)$ Construct an x$-$bar chart using the data in the table. Is the process in control? If not, can you

determine the out of control point $($points$)?[12$ pts$]$