The algebra synthesis method is used to obtain the expectation and variance of the assemble responses. The reliability model of mechanism motion function can be built.
采用代数综合法求得机构输出总位移的均值和方差，建立了机构运动功能可靠性的分析模型。
Second, a convex distribution model for the price is proposed. The formulae are given respectively for the expectation price, the variance of the price and the income.
其次，提出了价格的凸分布模型，并给出了期望价格，价格的方差和期望收益的计算公式。
The other one is the cause of institutional variance, which is expectation of latent maxim benefit.
二是制度变迁的诱致因素在于主体期望获取最大的潜在利润。
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