然后得出基本情况，最好情况，最差情况下的净现值，再计算平均净现值和标准偏差，（粗略地）估计该项目的内部固有风险的大小。

Then obtain base-case, best-case, and worst-case NPV and calculate mean NPV and standard deviation to (roughly) estimate the magnitude of the risk inherent to the project.

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实验也证明，取样方差估计值的标准偏差与样本数目的平方根之积可近似为一常数。

It revealed that the product of the standard deviation of the estimated sampling variance and square root of the number of samples was a constant.

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