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

Question 65

Multiple Choice

The mean of the sample means and the pooled standard deviation of 40 samples of size 5 taken from a production process under control are found to be 400 and 15,respectively.The lower control limit for the xˉ\bar { x } chart is:


A) 460.37
B) 392.88
C) 379.88
D) None of these choices.

Correct Answer:

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