Question: A lab process has an average turnaround time of 2 5 . 8 minutes and a standard deviation of 1 . 2 4 minutes. The

A lab process has an average turnaround time of 25.8 minutes and a standard deviation of 1.24 minutes. The nominal (target) value for the process is 25 minutes with an upper specification limit of 30 minutes and a lower specification limit of 20 minutes. The lab director wants to have four-sigma performance for the lab.

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