Question: The following X chart depicts the last 50 samples taken from the output of a process. Using the Western Electric rules, is the process detected

The following X̅ chart depicts the last 50 samples taken from the output of a process. Using the Western Electric rules, is the process detected to be out of control at any time? If so, specify at which sample the process is first detected to be out of control and which rule is violated.

3 20 lo lo -20 30 10 20 30 40 50

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