Question: 10 samples from a certain process shows that the average of all sample ranges is 2.3 cm and the overall average among all samples is

10 samples from a certain process shows that the average of all sample ranges is 2.3 cm and the overall average among all samples is 29 cm. Each sample contains 7 items. What is the 3-sigma lower control limit of the R-chart?

to 2 decimal places

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