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 2 3 4 5
156.9 153.2 153.6 155.5 156.6
4.2 4.6 4.1 5.0 4.5
a) Draw Mean chart, considering that standard deviation is 1.75.
b) Draw the Mean-chart for this dimension, using the data observed in the table above.
Please provide step-by-step solution
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