摘要
文章构造两例,分别说明两个正态随机变量之和不是正态随机变量,而n个(n≥3)正态随机变量之和亦不是正态随机变量,对教学具有一定的指导意义.
This paper constructs two examples to explain the sum of two nomal random variables is not nomal random variable, the sum of n nomal random variables is not the nomal random varible either. This conclusion is of direct significance for teaching.
出处
《绍兴文理学院学报(自然科学版)》
2005年第9期30-32,共3页
Journal of Shaoxing College of Arts and Sciences
关键词
正态
分布
随机变量
线性组合
normal
distribution
random variable
linear combination