A six sigma defect rate is six standard deviations above the mean rate.

Name: A six sigma defect rate is six standard deviations above the mean rate.
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Quizplus · Accepted Answer

This is a fundamental concept of six sigma, where a six sigma process is one that has an extremely low defect rate, with only 3.4 defects per million opportunities. This corresponds to a defect rate that is six standard deviations above the mean rate, assuming a normal distribution of defects.

A Six Sigma Defect Rate Is Six Standard Deviations Above