That'll be the weighted average.

这就是成绩的加权比例

耶鲁公开课 - 基础物理课程节选

But they're accountable and we can list all possible values when they're discrete and form a probability weighted average of the outcomes.

但随机变量是离散的话,我们可以把所有的可能值列出来,然后算出加权平均值

耶鲁公开课 - 金融市场课程节选