What is the average run length (ARL)until an control chart signals a false alarm if the control limits are set at ±2 standard errors from the centerline?

Name: What is the average run length (ARL)until an control chart signals a false alarm if the control limits are set at ±2 standard errors from the centerline?
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What is the average run length (ARL)until an  control chart signals a false alarm if the control limits are set at ±2 standard errors from the centerline?

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The Answer of What is the average run length (ARL)until an  control chart signals a false alarm if the control limits are set at ±2 standard errors from the centerline?

What Is the Average Run Length (ARL)until an Control