6 Sigma Management 60 2700 ppm outside 3 limits +30 一一一一 Normal spec limits 2700 ppm outside spec limits Distribution 一一一一一 +6 2700 ppm outside 3o limits 2 ppb outside 60 limits 2 ppb outside spec limits Why is 3.4 ppm,not 2ppb outside 6 sigma limits? Statistics for Managers Using Microsoft Excel Chap1-19 6 Sigma Management Normal Distribution Statistics for Managers Using Microsoft Excel Chap 1-19 Why is 3.4 ppm, not 2ppb outside 6 sigma limits?