expected value

柯林斯词典

expected value

• 1. N the sum or integral of all possible values of a random variable, or any given function of it, multiplied by the respective probabilities of the values of the variable. Symbol: E(X). E(X) is the mean of the distribution; E(X–c) = E(X)–c where c is a constant 數學期望值 (Also called mathematical expectation)[statistics]

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