Question: 3. Checkout time at a supermarket is monitored using a mean and a range chart. Six samples of n 20 observations have been obtained and

3. 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 Mean Range Sample Mean Range 1 3 .06 .42 4 3.13 .46 2 3.15 .50 5 3.06 .46 3 3.11 .41 6 3.09 .45 a. Using the factors in Table 10.3 , determine upper and lower limits for mean and range charts. b. Is the process in control?

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