A Proposal for Six Sigma Integration for Large-Scale Production of Penicillin G and Subsequent Conversion to 6-APA

Table 1

Probability of defects of different Sigma levels at a fixed process mean reproduced from elsewhere [43].

Sigma quality level	Nondefect rate	Defect rate (ppm)
𝜎	68.26894	317,311
2𝜎	95.44998	45,500
3𝜎	99.73002	2,700
4𝜎	99.99366	63.4
5𝜎	99.999943	0.57
6𝜎	99.9999998	0.002

“ppm”: parts per million.