Auto pistons at a plant in United States are produced in a forging process, and the diameter is a critical factor that must be controlled. From sample sizes of 10 pistons produced each day, the mean and the range of this diameter have been as follows: Day Mean (mm) Range (mm) 1 156.9 4.2 153.2 4.6 153.6 4.1 4. 155.5 5.0 5 156.6 4.5 a) Draw Mean chart, considering that standard deviation=1.75 b) Draw the Mean-chart for this dimension, using the data observed in the table above. 2.

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