normal population variance 正态总体方差
normal-activity variance 正常业务量差异
As long as prices do not vary in an extreme amount, then 1 or 2 pips is a normal variance between the different servers.
只要价格差异不超出一个极端的量，不同的服务器有1 - 2点的差距是正常的。
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。
The quadratic method to food spot which gains made the variance computation, rejected noise spots which were apart from other normal spots, so that it obtained the expected food distribution position.
二次方差法对已获取的食物点作方差计算，快速剔除距其他点较远的噪声点，获得食物分布的期望位置。
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