Question: 1. Checkout time at a supermarket is monitored using a mean and x-range change. Eight samples of n=20 observations have been obtained and the sample

1. Checkout time at a supermarket is monitored using a mean and x-range change. Eight samples of n=20 observations have been obtained and the sample mean and ranges computed: Using the tabular information above, (a) design a mean chart, (b) design a range chart, and (3) a mean range chart, along with the upper and lower limits for each chart along with a graph. Is the process in control when reviewing all three charts?

Sample	Mean	Range
1	3.12	0.72
2	3.28	0.60
3	3.48	0.42
4	3.30	0.36
5	4.30	0.52
6	3.50	0.58
7	3.73	0.54
8	3.34	0.51

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