Multiple choice six-sigma green-belt

If the total Defects in your process is ZERO, the calculated sigma value is :

  1. 0

  2. 6

  3. 1

  4. Cannot be calculated

Reveal answer Fill a bubble to check yourself
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.