On average, how many units will be produced until the control chart signals that the process is

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On average, how many units will be produced until the control chart signals that the process is out of control when it is under control?


A production facility produces 100 units per hour and uses an x chart to monitor its quality. The control limits are set at 3 standard errors from the mean. When the process goes out of control, it usually shifts the mean by 1.5 standard deviations. Sampling is conducted once per hour with a sample size of 3.

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