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

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	156.9	4.2
2	153.2	4.6
3	153.6	4.1
4	155.5	5.0
5	156.6	4.5

Part 4 c) What are the (UCLx) and (LCLx) using 3-sigma?

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

(LCLx) = mm