Question: You want to develop a three-sigma X-Chart. You know the mean of the means is 20 and the average range is 5 based on several

 You want to develop a three-sigma X-Chart. You know the mean

You want to develop a three-sigma X-Chart. You know the mean of the means is 20 and the average range is 5 based on several samples of size 10 . What is the LCL of the X-Chart? Round your answer to two decimal places. 15.26

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