What if not all parts hit worst-case at the same time?
Statistical method uses Root Sum Square (RSS):
Total tolerance = √(T₁² + T₂² + T₃² + …)
Assumption:
- Variations follow normal distribution
- Parts are independent
Pros:
✔ More realistic
✔ Reduces manufacturing cost
Cons:
✘ Small probability of failure
Key takeaway:
✔ Best for high-volume production
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