## Definitions

### from The American Heritage® Dictionary of the English Language, 4th Edition

- n. The sum of all possible values for a random variable, each value multiplied by its probability of occurrence.
- n. The integral of the probability density function and a continuous random variable over its range of values.

### from Wiktionary, Creative Commons Attribution/Share-Alike License

- n. Of a discrete random variable, the sum of the probability of each possible outcome of the experiment multiplied by the outcome value (or payoff).

### from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

- n. the sum of the values of a random variable divided by the number of values

## Etymologies

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## Examples

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