If the total Defects in your process is ZERO, the calculated sigma value is :
-
0
-
6
-
1
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Cannot be calculated
D
Correct answer
Explanation
Sigma calculation requires the formula: Sigma = NORMSINV(1 - defects/opportunities) + 1.5. When defects are zero, the defects/opportunities ratio becomes 0, requiring NORMSINV(1), which is undefined. Division by zero in the DPMO calculation also creates mathematical impossibility. Therefore sigma cannot be calculated with zero defects - it's a singularity.