Question: Refer to Table 56.1 - Factors for Computing Control Chart Limits (3 sigma) for this problem. Auto pistons at Wemming Chung's plant in Shanghai are

Refer to Table 56.1 - Factors for Computing Control Chart Limits (3 sigma) for this problem. Auto pistons at Wemming Chung's plant in Shanghai 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 1 2 3 Mean x (mm) 156.9 153.2 153.6 157.5 158.6 Range R (mm) 4.2 4.8 3.9 4.8 4 5 4.7 a) What is the value of ? X mm (round your response to two decimal places)

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