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  • 25-11-2022
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A process, when in control, produces a normally distributed output with a mean X-bar of 100 and a mean range of R-bar of 16. When using samples of size 20 and 3 Standard Deviation control limits, then which of the following is the lower control limit of the R chart?
Group of answer choices
6.63
2.28
12.80
16.00
6.80

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