The expectation and variance of LAR formula is given by inference under normal distribution.
推导出了正态分布下大额赎回量的期望和方差计算公式。
In this paper, we consider both the mathematical expectation and variance for the time to failure of some systems and design a system with ideal reliability.
本文研究系统寿命的均值和方差，并设计出较为理想的可靠性系统。
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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