Question: You are sampling 8 items from a process every half hour and plotting the average and range on control charts. Your long run average value

You are sampling 8 items from a process every half hour and plotting the average and range on control charts. Your long run average value is 14.628 and your average range is 3.66. What is the lower control limit for your averages? 13.395 13.263 12.860 13.094

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