Refer to Table S6.1 - Factors for Computing Control Chart Limits (3 sigma)

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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	Mean x (mm)	Range R (mm)
1	154.9	4.4
2	153.2	4.4
3	155.6	3.9
4	155.5	4.8
5	158.6	4.7

a) What is the value of

x?

x=155.56

mm (round your response to two decimal places).b) What is the value of

R?

R=

mm (round your response to two decimal places).

Enter your answer in the answer box and then click Check Answer.