Sigma Level (σ) - is a representation of the process capability in terms of opportunities and defects. It refers to number of defects per million opportunities (DPMO). Higher the sigma level, lower the number of defects
1σ = 691,462 DPMO
2σ = 308,538 DPMO
3σ = 66,807 DPMO
4σ = 6,210 DPMO
5σ = 233 DPMO
6σ = 3.4 DPMO"
An application-oriented question on the topic along with responses can be seen below. The best answer was provided by Vastupal Vashisth on 14th May 2019.
Applause for the respondents -Vastupal Vashisth, Ransingh Satyajit Ray, Sabbyasachi Maukherjee, KiranKumar, Sreyash Sangam
Also review the answer provided by Mr Venugopal R, Benchmark Six Sigma's in-house expert.