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expected value

/ɪkˈspektɪd ˈvæljuː/

翻译: 概率论与统计学中的术语,指随机变量的平均值,即所有可能取值与其对应概率乘积的总和;也泛指在不确定情况下预期的长期平均结果。

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C1formalcommontechnical/ɪkˈspektɪd ˈvæljuː/

A statistical term referring to the average or mean value of a random variable, calculated as the sum of all possible values each multiplied by their probability of occurrence.

  • 🇨🇳概率论与统计学中的术语,指随机变量的平均值,即所有可能取值与其对应概率乘积的总和;也泛指在不确定情况下预期的长期平均结果。
  1. Mathematical expectation C1 formal

    The sum of all possible values of a random variable, each multiplied by its probability of occurrence.

    • The expected value of a fair six-sided die roll is 3.5.
    • In gambling, the expected value is often negative for the player.
    • The expected value of the investment was calculated to be $500.

    🇨🇳数学期望