摘要
数学期望是概率统计中随机变量最重要的数字特征之一,本文通过一些例子,给出了数学期望的几种求法.
The mathematic expectation is one of the most important concepts of random variable in probability statistics. Through several examples, in the paper, the authors give several methods about the calculation of mathematic expectation.
出处
《枣庄学院学报》
2012年第2期33-36,共4页
Journal of Zaozhuang University
关键词
数学期望
随机变量
特征函数
mathematic expectation
random variable
characteristic function
