Figure 1: a normal distribution with mean 3 and variance 1.
图1：平均值为3且方差为1的正态分布。
It's very important to understand what the mean-variance frontier actually means.
要理解边界上的平均方差真正的含义是非常重要的。
One is to compare the sample mean and the sample variance.
当样本均值大于样本方差时，认为是服从二项分布；
One is to compare the sample mean and the sample variance.
当样本均值大于样本方差时，认为是服从二项分布；
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