SUPERMARKET PROBLEM: Checkout time at a supermarket are being monitored. Six samples of 20 observations cach have been obtained and the sample means and ranges calculated as shown in the table For this supermarket checkout problem, based on the calculations you have done in the other questions, what can you conclude about the checkout time at the supermarket? Mean Sample 1 1 2 3.06 3.15 3.11 Range 0.42 0.51 0.41 0.46 3 4 3.13 5 0.46 3.06 3.09 6 0.45 Checkout time is in control Additional data is needed to evaluate checkout time Checkout time is not in control Checkout time is fast enough