Question: DPMO = 41000000/(1500) = 8000; this is between 3.5 and 4 sigma level. 1. Who is generally credited for the formal beginning of statistical quality

DPMO = 4×1000000/(1×500) = 8000; this is between 3.5 and 4 sigma level. 1. Who is generally credited for the formal beginning of statistical quality control? When was this?

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