Six-sigma is commonly used to describe the "gold-standard" of quality in a process. Sigma is a measure of the standard deviation. Six sigma is the value (of an observation) that is six standard deviations away from the mean of the distribution of observations.
In a manufacturing process, approximately how many parts would be produced that fall inside the tolerance limits for every one part that lies outside those limits if the process is "sixsigma"?
7,472
672,622
164,585,135
109,472,425,569
197,930,788,642,469