Loan Processing times are being monitored at a local company. Samples of six observations each have been taken, and the results are listed. Using Factors from Table 10.3, determine lower and upper control limits for a a mean chart
Sample Number 1 2 3 4 5
------------- 75 71 74 79 80
------------- 74 76 61 75 68
------------- 79 62 74 73 81
------------- 71 70 74 75 71
------------- 71 79 74 74 73
------------- 73 79 80 74 70