i In a glass factory the task of quality control was done with the help of means (X) and standard deviation (o) charts. 18 samples of 10 items each were chosen and EX and Eo were found to be 595.8 and 8.28 respectively. Determine 30 limits for and standard deviation charts. You may use the following control factors for your mean calculation : A, B2 B4 1.03 0.28 1.72 10

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