Well let's think about just a normalized normal distribution.

好吧，让我们考虑一个标准化的正态分布。

If you look at a normal distribution, a completely normalized normal distribution, it's mean is at 0.

如果你看一个正态分布，一个完全归一化的正态分布，它的均值为 0。

So the probability of getting a Z-value less than 1.65, or even in a completely normalized normal distribution, the probability of getting a value less than 1.65.

所以得到 Z 值小于 1. 65 的概率，甚至在完全归一化的正态分布中， 得到值小于 1. 65 的概率。