The Mean of the Sample Means and the Pooled Standard $\bar { x }$

question 34

Multiple Choice

The mean of the sample means and the pooled standard deviation of 25 samples of size 4 taken from a production process under control are found to be 150 and 10,respectively.The centerline for the $\bar { x }$ chart is:

• A) 150
• B) 100
• C) 250
• D) 6

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