Question: An x chart is used to control the mean of a normally distributed quality characteristic. It is known that = 6.0 and n =

An x chart is used to control the mean of a normally distributed quality characteristic. It is known that σ = 6.0 and n = 4. The center line = 200, UCL = 209, and LCL = 191. If the process mean shifts to 188, find the probability that this shift is detect on the first subsequent sample.

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