And each of them are independent, standard, normal, normally distributed random variables.

而且每一个都是独立的、标准的、正态的、正态分布的随机变量。

Let's say I have another random variable, Q2, that is defined as-- let's say I have one independent, standard, normally distributed variable.

假设我有另一个随机变量 Q2，它被定义为-- 假设我有一个独立的、标准的、正态分布的变量。

And since we're only taking one sum over here-- we're only taking the sum of one independent, normally distributed, standard or normally distributed variable, we say that this only has 1 degree of freedom.

由于我们在这里只取一个总和——我们只取一个独立的、正态分布的、标准的或正态分布的变量的总和，我们说这只有 1 个自由度。