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	4.4
2	151.2	4.4
3	151.6	4.1
4	153.5	5.2
5	156.6	4.3

If the true diameter mean should be 155 mm and you want this as your center (nominal) line, what are the new UCLx and LCLx?