摘要
在三种不同情况下,对两个随机变量和的分布类型进行了研究,证明了一个离散型随机变量与一个连续型随机变量的和在一定条件下为连续型随机变量,发现两个连续型随机变量的和却不一定是连续型随机变量,而两个非连续型随机变量的和也可能为连续型随机变量.
In this paper ,we investigate the type of probability distribution about the summation of two random variables under three different circumstances ,and prove that the summation of a discrete random variable and a continuous one can be a continuous random variable under some conditions .We also find out that the summation of two continuous random variable may not be a continuous one ,and the summation of two discontinuous random variables may be a continuous one .
出处
《湘南学院学报》
2014年第2期20-22,共3页
Journal of Xiangnan University
关键词
随机变量
离散型
连续型
相互独立
random variable
discrete type
continuous type
mutual independence
