Question

3 sigma charts

Auto pistons at the plant are produced in a forging process,and the diameter is a critical factor that must becontrolled.From sample sizes of 10 pistonsproduced eachday, the mean and the range of this diameter have been asfollow:DayMean(mm)Range1156.94.22153.24.63153.64.14155.55.05156.64.5Construct the 3 sigma x chart and the 3 sigma R chart for thisdimension using the data observed in the above table

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