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For 10 samples of 5 items each, sum of sample means = 256.8 and ΣR = 7.85. Compute 3 sigma control limits for mean chart (for n = 5, A2 = 0.58). |
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Answer» Given k = 10 ΣX̄ = 256.8 , Σ R = 7.85 , n = 5 Here standards are not given, 5 im control limits for X̄ = charts are , C.L = X̄ = 25.68 L.C.L = X̄ – A2R̄= 25.68 = 0.58 x 0.785 = 25.22 U.C.L = X̄ + A2R̄ = 25.68 – 0.58 x 0.785 = 26.14 |
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