If you have an experiment and the outcome of the experiment is a number, then a random variable is the number that comes from the experiment.

如果你有一个试验,这个试验的结果是一个数,那么相对应的随机变量,指的就是这个试验结果所对应的那个数

耶鲁公开课 - 金融市场课程节选

So this declares an integer, a variable of type int called I, 0 and initializes it to zero.

所以这里声明了一个整型数，一个叫做I的整型变量，把它初始化为。

哈佛公开课 - 计算机科学课程节选

The basic definition-- the expected value of some random variable x--E--I guess I should have said that a random variable is a quantity that takes on value.

最基本的定义,某一个随机变量X的期望值E,我应该提到过,随机变量是一个可以取值的数

耶鲁公开课 - 金融市场课程节选

So if, in fact, we want to describe a wave function, we know that we need to describe it in terms of all three quantum numbers, and also as a function of our three positional factors, which are r, the radius, phi plus the two angles, theta and phi.

实际上，我们想描述波函数，我们知道我们需要,用这三个量子数来描述它，同样，波函数还是,三个位置变量的函数，它们是r半径，还有两个角度theta和。

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