Question: An x - bar chart is used to control the mean of normally distributed quality characteristic. It is known that sig = 1 0 .

An x-bar chart is used to control the mean of normally distributed quality characteristic. It is known that sig =10.0(standard deviation of process) and n=4. The center line =200. UCL =210, and LCL =190. If the following rule is used for detecting the change.

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