Refer to Table 56.1. 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 es fa Day Mean x (mm) 156.9 155.2 155.6 155.5 154.6 1 2 3 4 5 I Range R (mm) 4.2 4.6 4.3 4.8 4.7 a) What is the value of ? X= mm (round your response to two decimal places). Mean Factor, Sample Size, n Upper Range, A2 Lower Range, D3 D4 3 4 D000 W N 1.880 1.023 0.729 0.577 0.483 0.419 0.373 n 337 3.268 2.574 2.282 2.115 2.004 1.924 1.864 1816 0 0 0 0 0 0.076 0.136 n 184 Print Done 2 3 4 5 6 7 8 9 10 12 1.880 1.023 0.729 0.577 0.483 0.419 0.373 0.337 0.308 0.266 3.268 2.574 2.282 2.115 2.004 1.924 1.864 1.816 1.777 1.716 0 0 0 0 0 0.076 0.136 0.184 0.223 0.284