Statistics & Probability
Expected Value
Mean of a discrete distribution.
Formula
Formula
E[X] = Σ xi pi
Variables
| Symbol | Definition | Type & range | Units | Role |
|---|---|---|---|---|
| xᵢ | outcomes | list of real numbers | — | input |
| pᵢ | probabilities | list of real numbers | — | input |
Try it yourself
Interactive calculator
Worked examples
Example 1
Givenvalues = 1, 2, 3, 4, 5, 6, probabilities = 0.166667, 0.166667, 0.166667, 0.166667, 0.166667, 0.166667
Result3.500007
Example 2
Givenvalues = 0, 1, probabilities = 0.5, 0.5
Result0.5