A Manufacturer Embarking on a Six Sigma Program Sets the Goal

A manufacturer embarking on a Six Sigma program sets the goal of having true Six Sigma capability for all processes by the end of the month.If their current process capability index on a key metric is less than 2.0 and the process capability ratio is 1.5,what must happen with the process standard deviation?

A) The process standard deviation must be reduced by 25%.
B) The process standard deviation must be reduced by 33%.
C) The process standard deviation must be reduced by 50%.
D) The process standard deviation must be reduced by 67%.