一、随机变量及其分类 许多随机现象的结果都是直接和数值相联系的,如考试的成绩、跳远的距离、一篇作文中的错别字数等。对这种随机现象可以用另一种方法来描述,如对学生数学考试这一问题,令X=考试的可能成绩,则X的取值是0,1,2,…,100中的任一个,并且基本事件{0},{1},{2},…,{100}可通过X来表示 First, the random variables and their classification Many random phenomena are directly linked to the results and values, such as test scores, long jump distance, the number of typos in an essay and so on. The stochastic phenomenon can be described in another way. For example, for the student math test, let X = the possible test score, then the value of X is 0, 1, 2, ..., 100 , And the basic events {0}, {1}, {2}, ..., {100} can be represented by X