Question: Refer to Table S6.1 - Factors for Computing Control Chart Limits (3 sigma)LOADING... for this problem. Auto pistons at Wemming Chung's plant in Shanghai are

Refer to Table S6.1 - Factors for Computing Control Chart Limits (3 sigma)LOADING... 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	Meanx (mm)	Range R (mm)
1	156.9	4.4
2	151.2	4.4
3	153.6	4.3
4	155.5	5.2
5	154.6	4.7

a) What is the value of x?

x=( ) mm (round your response to two decimal places).

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