Question: You want to develop a three - sigma R - Chart. You know the average range is 7 based on several samples of size 9

You want to develop a three-sigma R-Chart. You know the average range is 7 based on several samples of size 9. What is the LCL of the R-Chart? Round your answer to two decimal places. Choices: 1.12,8.85,1.29,12.71, or .82

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