Refer to Table S6.1-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 controlled. From sample sizes of 10 pistons produced each day, the mean and the range of this diameter have been as follows a) What is the value of X? x= mm (round your response to two decimal places). Mean x Day (mm) Range R (mm) 1 154.9 4.4 2345 155.2 4.6 153 6 4.1 157.5 5.2 5 156.6 4.7