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 ∑ X 25 =1 = 4010 Grams and ∑ 25 =1 = 72 grams , respectively.

A cricket ball manufacturing company wants to check the variation in t

1.	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 ∑ X 25 =1 = 4010 Grams and ∑ 25 =1 = 72 grams , respectively.
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