An control chart with three-sigma control limits has UCL =
Chapter 15, Problem 6E(choose chapter or problem)
An \(\bar{X}\) control chart with three-sigma control limits has \(\(U C L=48.75\) and \(\mathrm{LCL}=42.71\). Suppose that the process stand-ard deviation is \(\sigma=2.25\). What subgroup size was used for the chart?
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