The Six Sigma process received its name from:
a) The intersection of six bell curves, where there are no errors
b) Six degrees of freedom in removing an error, called "sigma"
c) Six tries to change or give up
d) Six standard deviations, or less than 3.4 defects per million
e) Sigma, the computer company that invented it
Answer: Six standard deviations, or less than 3.4 defects per million