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。
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