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 produced in

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 controled. From sample sizes of 10 pestone produced each day, the mean and the range of this diameter have been as follows Day Mean x (mm) Range R (mm) 1 154.9 4.2 2 155.2 4.4 3 155.6 4.3 4 153.5 52 158.6 4.3 a) What is the value of x? mm (round your response to two decimal places) 5

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