An airline performed 4000 preflight inspections during one month. Each inspection checks 50 items. What is the maximum number of defects that could occur during a year if the process is operating at a six-sigma level?
epmo = (Number of defects discovered/opportunities for error) x1,000,000
Number of opportunities for error = (4000) x (50) = 200,000 .
Thus, epmo = (X/200000) x 1,000,000 = 3.4
So, X = 0.68 . Thus, during a year, at most 12(0.68) = 8.16 (around 8 or 9) defects would be found if the process were at a six-sigma level.
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