Concept information
Preferred term
expected value
Definition
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In probability theory, the expected value (also called expectation, expectancy, expectation operator, mathematical expectation, mean, expectation value, or first moment) is a generalization of the weighted average. Informally, the expected value is the arithmetic mean of the possible values a random variable can take, weighted by the probability of those outcomes. Since it is obtained through arithmetic, the expected value sometimes may not even be included in the sample data set; it is not the value you would "expect" to get in reality.
(Wikipedia, The Free Encyclopedia, https://en.wikipedia.org/wiki/Expected_value)
Broader concept
Entry terms
- average
- expectancy
- expectation
- first moment
- mathematical expectation
- mean
In other languages
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French
-
moment d'ordre 1
URI
http://data.loterre.fr/ark:/67375/PSR-WWJFK6LW-G
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