本文讨论母体原点矩的线性有偏估计问题。
The problem for linear biased estimation of the population origin moment is discussed in this paper.
其计算步骤可描述为：给定注入功率的概率描述，计算各阶原点矩；
Steps are as follows:given the probability of the injected power, calculate each origin moment;
另一方面讨论了随机利率下的一些离散年金、连续年金和连续生存年金现值随机变量的一阶和二阶原点矩及其方差。
On the other hand, the moment, the second moment and variance of the present value random variables about some life annuities and annuities with random interest rate are gotten.
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