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I need help understanding how the calculations of the Upper Control Limit of 24.78332 and the Lower Control Limit of 0.816678 were made. I need
I need help understanding how the calculations of the Upper Control Limit of 24.78332 and the Lower Control Limit of 0.816678 were made. I need those formulas. Also, I need to understand how the Control Chart was plotted. Images attached.