Times n times the mean of the xy values, the arithmetic mean.

乘以 n 乘以 xy 值的平均值，即算术平均值。

And remember, expected value, in a lot of contexts, you could view it as just the arithmetic mean.

请记住，期望值，在很多情况下，您可以将其视为算术平均值。

They are the mean-- actually, there are types of means, but we'll stick with the arithmetic mean.

它们是平均值——实际上，有多种类型的平均值，但我们将坚持使用算术平均值。

The arithmetic mean was skewed by what they'd call an outlier.

算术平均数被​​他们所谓的异常值所扭曲。

So the mean, or the arithmetic mean, is probably what you're most familiar with when people talk about average.

所以当人们谈论平均值时，平均值或算术平均值可能是您最熟悉的。

But the idea is almost as straightforward as the arithmetic mean.

但这个想法几乎和算术平均数一样简单。

So the arithmetic mean of both of these populations are the same number.

所以这两个总体的算术平均值是相同的数字。

So instead of taking the mean-- let's say how I wanted to calculate the average by taking the arithmetic mean.

因此，与其取平均值，不如说我想如何通过取算术平均值来计算平均值。

And then you take the arithmetic mean of those two numbers.

然后你取这两个数字的算术平均值。

Well, here, sure their mean, their arithmetic mean, is 2.5, but they're further away from 2.5.

好吧，在这里，确定他们的平均值，他们的算术平均值，是 2.5，但他们离 2.5 更远。