Fix each denominator
Synthetic ten-minute batch has 900 North requests all successful and 100 South requests with 80 successful. Local acceptance needs overall at least 95% and each region at least 90%. These are exercise thresholds, not service guarantees.
| Region | Successful /total | Rate |
|---|---|---|
| North | 900 /900 | 100% |
| South | 80 /100 | 80% |
| Overall | 980 /1000 | 98% |
Calculate weighted and regional results
- Add counts, not regional percentages
- Check overall threshold
- Check each region independently
An empty region has no observed rate; do not treat it as 100%.
Does the batch pass the supplied policy?
Show the worked answer
No. Overall 98% passes 95%, but South 80% fails 90%. The weighted average does not remove the regional failure.
Apply the actual acceptance rule
| Case | Decision | Reason |
|---|---|---|
| Overall-only review | Incomplete | Misses South constraint |
| Overall plus both regions | Reject batch | South below 90% |
Keep the region field in the result export. Removing it would make this policy impossible to evaluate from the aggregate alone.