一种方法是先优化得到结构功能函数的最大和最小值，再计算功能函数均值和离差的比值；
One method was getting the maximum and the minimum of the structural performance function by optimization, and then calculating the ratio of mean-value to deviation of the performance function.
利用检验的办法确定了PERT假设前提对工序时间的均值、标准离差及总工期所产生的误差。
The errors of the mean and standard deviation of the time of activity and project completion caused by assumptions are given by means of deviation tests.
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