The weighted mean of the random variable is the expected value.
随机变量的加权平均值是期望值。
The expected overall value of the estimate (E) is the weighted average
期望的整体估计（E）值是加权平均值
The technical definition of variance is the random variable's second central moment, the weighted average of the square of the differences from the expected value.
3方差的专业定义是随机变量的二次中心矩，与期望值之差的平方的加权平均值。
An expected value (or ev) is a weighted average value, based on probabilities. The expected value for a single event can offer a helpful guide for management decisions.
预计值是基于发生概率的一个加权平均值。预计值对于单一事件时可以给予管理决策一个很好的导向。
An expected value (or ev) is a weighted average value, based on probabilities. The expected value for a single event can offer a helpful guide for management decisions.
预计值是基于发生概率的一个加权平均值。预计值对于单一事件时可以给予管理决策一个很好的导向。
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