**Notation in probability and statistics - WikiMili, The ...**
https://wikimili.com/en/Notation_in_probability_and_statistics

In probability theory, the expected value of a random variable , denoted or , is a generalization of the weighted average, and is intuitively the arithmetic mean of a large number of independent realizations of .The expected value is also known as the expectation, mathematical expectation, mean, average, or first moment.Expected value is also a key concept in economics, finance, and many other ...

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