The mean of the sample means and the pooled standard deviation of 50 samples of size 10 taken from a production process under control are found to be 225 and 16,respectively.The upper control limit for the $\bar { x }$ chart is:
A) 231.79
B) 240.18
C) 218.21
D) 209.82

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The Answer of The mean of the sample means and the pooled standard deviation of 50 samples of size 10 taken from a production process under control are found to be 225 and 16,respectively.The upper control limit for the $\bar { x }$ chart is:
A) 231.79
B) 240.18
C) 218.21
D) 209.82

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

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