Question: A manager wants to build a 3-sigma range chart for a process. 5 samples are collected, with each of them containing 6 items. The average

A manager wants to build a 3-sigma range chart

A manager wants to build a 3-sigma range chart for a process. 5 samples are collected, with each of them containing 6 items. The average of all sample means is 15.01, and the average range is 6.4. What is the LCL for this range chart

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