A family-owned convenience store is interested in monitoring the quality of customer service at the checkout counter. Five service times in minutes have been randomly recorded daily for a week and the data are given in Table 1.9. Develop the variable control charts for the mean and range for monitoring the QoS.

TABLE 1.9:

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Service Time in Minutes (Exercise 1.7) Sample 1 Sample 2 Sample 3 Sample 4 Sample 5 1 24 10 2 10 N 5 5 2 22722 1 3 350 213 Day 4 545 1 5 5 31221 6 351ww 4 7 10 10 10 10 10 5 5 5 3 5