Question: 7.(10 pts) Checkout time at a supermarket is monitored using a mean and a range chart. Six samples of n=20 observations have been obtained and

7.(10 pts) Checkout time at a supermarket is

7.(10 pts) Checkout time at a supermarket is monitored using a mean and a range chart. Six samples of n=20 observations have been obtained and the sample means and ranges computed: Sample 1 2 3 4 5 6 Mean 5.06 5.15 5.11 5.13 5.09 5.06 Range 0.42 0.50 0.41 0.46 0.45 0.46 Determine the upper and lower limits for mean and range charts. Is the process in control? If not, explain why not

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