The standard statistical approach to risk management is based on a “bell curve” or normal distribution, in which most results are in the middle and extremes are rare.

在统计学中，风险管理的标准方法是基于“钟形曲线”（或曰正态分布）的，绝大多数结果分布在中间，极端情况十分罕见。

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The standard pattern distribution of normal population: Most (74.5%, 82/110) of the unrelated healthy individuals displayed such a pattern without any translocation, hybridization and mosaicism.

正常人的标准带型分布：在检测的110名正常人中，74.5％（82／110）为标准带型，无易位、杂合、体细胞嵌合等情况。

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The table of standard normal distribution was handled correctly by use of Raphson numerical integral, by this way, the optimum design was connected with reliability design organically.

文中提出采用辛卜生数值积分较好地处理了正态分布数值表，从而将优化设计与可靠性设计有机地结合起来。

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