1.

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).

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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