A random variable is a function that takes values based on a probability distribution.

随机变量是一个根据概率分布取值的函数。

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Instead of this single value, a random variable has a function that describes the likelihood of values for the estimate and is called the variable's probability distribution.

取代单个值，随机变量拥有描述估计值可能性的函数，该函数称为变量的概率分布。

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First we compare rough sets and random sets, and derive the relationship between belief function and lower probability.

首先将粗糙集与随机集作了比较，并由此得出了信任函数与下概率的关系。

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