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【多选题】
下列关于随机事件和随机变量,表达正确的是:A.
随机事件指在同一组条件下，每次试验可能出现也可能不出现的事件。
B.
随机变量是采用数量标识描述随机现象的随机事件。
C.
若离散型随机变量X的可能值用xi表示，其对应的概率可用P(X=xi)=P(xi)，P(X)称为随机变量X的概率函数。
D.
按照取值特性，随机变量可分为离散型变量和连续性变量。
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