Question: In a process control study, the overall process average over 15 samples is 63. 45 with an average corresponding range of 5.6. What is the

In a process control study, the overall process average over 15 samples is 63. 45 with an average corresponding range of 5.6. What is the lower control limit of the R - chart? Assume each sample has 15 observations ( use the control chart limits as D3=0.35; D4=1.65)

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