THE NUMBERS, EXPLAINED
How to use this calculator.
Counts are for one test run; a hidden failure is an initially failing test that later passed. Retry attempts must include at least one attempt per recovered test.
Start with your inputs
Enter initial failed tests (count), failures passing on retry (count), retry attempts executed (count), mean retry duration (seconds). Keep amounts in the units shown on each field. The example is a starting point, not a recommended value.
| Input | Example value |
|---|---|
| Initial failed tests (count) | 10 |
| Failures passing on retry (count) | 6 |
| Retry attempts executed (count) | 12 |
| Mean retry duration (seconds) | 5 |
A worked example
With the example inputs above, masked failures (count) is 6. Change the inputs to explore your own scenario.
| Result | Example answer |
|---|---|
| Masked failures (count) | 6 |
| Unresolved failures (count) | 4 |
| Additional runtime (seconds) | 60 |
How this is calculated
Masked failures (count)
Count initially failed tests that passed on retry.
Unresolved failures (count)
Subtract recovered tests from initial failures.
Additional runtime (seconds)
Multiply retry attempts by measured average retry duration.
Symbols and units
- a
- Initial failed tests (count)
- b
- Failures passing on retry (count)
- c
- Retry attempts executed (count)
- d
- Mean retry duration (seconds)
Use the units shown. A list keeps the order in which you enter its values. The symbol ^ means “raised to the power of”.
Assumptions and limits
Counts are for one test run; a hidden failure is an initially failing test that later passed. Retry attempts must include at least one attempt per recovered test.
Calculations use the values you enter. Blank or invalid inputs show an error instead of silently substituting zero. Results are displayed to useful precision; calculations retain the underlying numeric precision.
Questions about this tool
What does the result tell me?
Masked failures (count); Unresolved failures (count); Additional runtime (seconds). The result applies to the method and inputs described above. Check the units and assumptions before using it in a decision.
Why might another calculator differ?
Differences in units, rounding, timing or model definitions can produce different answers. Compare the input definitions and the method, rather than only the final number. For this tool: Counts are for one test run; a hidden failure is an initially failing test that later passed. Retry attempts must include at least one attempt per recovered test.
Are my inputs stored or sent to AI?
Calculations on this page happen in your browser. The separate AI question finder sends its submitted conversation to OpenAI; these calculator fields are not sent. Favourites and recent tool names are stored locally. A shared link contains the inputs you choose to include.
Further reading
OpenStax Prealgebra 2e — arithmetic and proportions ↗
Background reading; this does not imply endorsement or independent review of SumFizz.
Review status
Software example and browser checks are recorded in our quality report. No external expert review is claimed. Created with coding assistance; calculations run as ordinary browser code.
Read the quality report →