variance of random variable 随机变数之变异数
Variance of discrete random variable 离散型随机变量的方差
variance of a random variable 随机变量的方差
variance of fuzzy random variable 模糊随机变量的方差
variance of fussy random variable 模糊随机变量的方差
variance of continuous random variable 连续型随机变量方差
The variance of a random variable measures how far from the expected value its values typically are.
随机变量的方差衡量随机变量值与期望值偏离的程度。
Demonstrate understanding of the concept and properties of a discrete random variable, including calculation and interpretation of the mean and variance.
示范不连续任意的变数观念和财产的理解，包括计算和解释那低劣的和不一致。
And finally, this tool-the generating function-can be used to get some expectation and variance of random variable of continual-type non-negative distribution.
最后利用母函数这一工具求得一些连续型非负分布随机变量的数学期望及方差。
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