Question: Probability out? An x chart plots the means of samples of size 4 against center line CL = 700 and control limits LCL = 687

Probability out? An x chart plots the means of samples of size 4 against center line CL = 700 and control limits LCL =

687 and UCL = 713. The process has been in control. Now the process is disrupted in a way that changes the mean to μ = 693 and the standard deviation to σ = 12. What is the probability that the first sample after the disruption gives a point beyond the control limits of the x chart?

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