Question: A teller at a drive - up window at a bank had the following service times ( in minutes ) for 2 0 randomly selected

A teller at a drive-up window at a bank had the following service times (in minutes) for 20 randomly selected customers. The sample standard deviation was calculated as 0.19, and the standard deviation of ranges was calculated as 0.096. What is the upper control limit (UCL) of the mean chart when z=3? What is the upper control limit (UCL) of the range chart when z=3?(Please round your answer to two decimal places)
A teller at a drive-up window at a bank had the

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