随机变量，如上例中的时间，与一些特性相关，这些特性不同于那些与单个值相关的特性。

A random variable, such as time in the example above, is associated with properties that are different from those associated with a single value.

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在数学术语中，不完全确定的值称为随机变量。

In mathematical terms, values that are not known with complete certainty are called random variables.

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随机变量的方差衡量随机变量值与期望值偏离的程度。

The variance of a random variable measures how far from the expected value its values typically are.

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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

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This refers to random variables that have fat-tailed distributions-- random variables that occasionally give you really big outcomes.

这就表示,服从长尾分布的随机变量,这些数据出现极端值的概率比较大

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That's different when you have continuous values-- you don't have P because it's always zero.

和离散型随机变量的分布不同的是,连续型随机变量的分布中,某一点的概率值始终是零

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