Question: You want to develop a three-sigma X-chart. You know the average range is based on 20 samples of size 10 each you also know that

You want to develop a three-sigma X-chart. You know the average range is based on 20 samples of size 10 each you also know that the average of the averages of the data is 15. which value is used for D4? Select one 1.92 1.78 1.65 2.11

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