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I need this question within 30 min from posting it. Twenty samples of subgroup size 6 (n = 7) were collected for a variable measurement. Determine the upper control limit (UCL) for an R-chart if the mean of the sample ranges equals 6.4. Factors for calculating control limits n A2 D3 D4 2 1.880 0 3.267 3 1.023 0 2.574 4 0.729 0 2.282 5 0.577 0 2.114 6 0.483 0 2.004 7 0.419 0 1.924 Note: i need the answer step by step.
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