Separate expected and received samples
The invented monitor expects 12 slots. It receives nine: eight healthy and one bad; three are absent. Local report requires observed success among received samples and coverage among expected slots. Missing slots are unknown, not assumed healthy or bad.
| State | Count | Meaning |
|---|---|---|
| Healthy | 8 | Observed |
| Bad | 1 | Observed |
| Missing | 3 | Unknown |
Use the right denominator twice
- Reconcile counts to twelve
- Divide healthy by received
- Divide received by expected
A received sample with no classified result also remains unknown until resolved.
What are the two ratios?
Show the worked answer
Observed success is 8/9, about 88.89%; coverage is 9/12=75%. No exact full-window service rate is established.
Keep unknown slots unknown
| Case | Decision | Reason |
|---|---|---|
| 8/9 success and 9/12 coverage | Accept report | Unknown slots retained |
| 11/12 success | Reject | Invents three healthy results |
The three absent slot identities belong in the worksheet. Recover their observations before replacing uncertainty with a full-window statement.