Question: An X-bar control chart designed with L=3 and constant sample size n has UCL=128.759 and LCL=127.241, if the process is under control and its standard

An X-bar control chart designed with L=3 and

An X-bar control chart designed with L=3 and constant sample size n has UCL=128.759 and LCL=127.241, if the process is under control and its standard deviation is sigma=0.8, what is the sample size "n"? 4 10 5 8 6 not enough information

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