Question: 10 samples from a certain process shows that the average of all sample ranges is 2.7 cm and the overall average among all samples is

10 samples from a certain process shows that the average of all sample ranges is 2.7 cm and the overall average among all samples is 30 cm. Each sample contains 7 items. What is the 3-sigma lower control limit of the R-chart?

Note: Round your final answer to 2 decimal places. (Do not include the unit of measurement in your answer.)

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