Probability calculator
Expected Value Calculator
Calculate the expected value of a finite discrete outcome distribution with explicit contributions and probability-total validation.
All entered values remain in this browser tab. No account, upload, persistence, URL state, or remote calculation is used.
Enter values
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Result
Formula and method
Expected value is Σ(xᵢpᵢ). Probabilities must total exactly 1 (or 100%) within a documented 1e-9 tolerance; the tool never silently normalizes them.
Worked example
Outcomes 0, 10, and 20 with probabilities 0.2, 0.5, and 0.3 have expected value 11.
Limitations
This handles a finite discrete distribution. It does not infer probabilities, model dependence, or predict a particular trial.