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 bold x overbar (mm) range r (mm) 1 156.9 4.4 2 155.2 4.4 3 153.6 4.3 4 157.5 4.8 5 158.6 4.5 (a) what is the value of x double overbar?

The value of x double overbar is 156.36.

Explanation:

x double overbar = [156.9 + 155.2 + 153.6 + 157.5 + 158.6 ]/5

                             = 156.36

 Therefore, The value of x double overbar is 156.36.  

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