Target-success waiting moments
Check the mean and variance of failures before a target success count.
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Use comma-separated finite numbers on two lines. Magnitudes must be at most 1e9 and at least 1e-12, or zero.
The starting values are hypothetical. Results update as you edit. Use aggregate or synthetic inputs only.
Calculation results
- Expected failures
- 3
- Failure-count variance
- 6
- Expected total attempts
- 6
How to interpret the output
Uses failures before an integer target number of successes. Independent attempts and constant success probability are assumed. Outputs are population moments. Source checked 11 November 2026.
Method reference