The Mean of the Sample Means and the Pooled Standard

question 1

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 chart is:

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

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