Question: LCL , CL , UCL ) = ( 9 0 , 1 1 0 , 1 3 0 ) for a 3 - sigma Xbar

LCL, CL, UCL)=(90,110,130) for a 3-sigma Xbar chart based on samples of size nine. The process is centered and in control, with 650 DPM falling below the lower specification limit. What is the probability that a shift in the mean to 115 will be detected before the fourth sample?

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