Question: The difference between the upper and lower control limits of an X-bar chart for a process is 15 units. Samples of size 7 have been

The difference between the upper and lower control limits of an X-bar chart for a process is 15 units. Samples of size 7 have been collected every hour for the past several months. Assuming that is not known, what is the implied average range from the above results (assume z=3 )? (Round it to two decimal points)

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