Question: Question 1: Checkout time at a supermarket is monitored using a mean and a range chart. Six samples of size 20 observations have been obtained

Question 1: Checkout time at a supermarket is

Question 1: Checkout time at a supermarket is monitored using a mean and a range chart. Six samples of size 20 observations have been obtained and the sample means and ranges computed: Sample Mean Range 3.06 0.42 3.15 0.50 3.11 0.41 3.13 0.46 3.06 0.46 3.09 0.45 Determine the upper and lower limits for mean and range charts. Is the process in control

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