Consider a process under statistical quality control. The upper specification limit of the statistic of interest...

Consider a process under statistical quality control. The upper specification limit of the statistic of interest is 101, while the lower specification is 42. The sample plan is for 7 samples per period. The average range of the process is 13. What is the capability of the process assuming it is centered exactly between the specification limits and the statistic of interest has a normal distribution?

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