Question

Q2. A cricket ball manufacturing company wants to check the variation in the weight of the balls. For this, 25 samples each of size 4, are selected and the weight of each ball is measured (in grams). The sum of the sample average and the sum of Sample ranges were found to be ΣX25=1=4010 Grams and Σ25=1=72 grams , respectively. Compute the control limits for the X and R-charts. It is given that A2 = 0.729, D3 = 0 and D4 = 2.282.

Answer 1

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