Question: The mean and standard deviation for a process are = 85 and = 10. For the variable control chart, a sample size of 21 will

The mean and standard deviation for a process are = 85 and = 10. For the variable control chart, a sample size of 21 will be used. The standard deviation of the sampling distribution is

2.18

1.84

1.92

2.12

2.25

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