Due to the bad weather, cotton yield poer mu is very low this year.

由于天气不好，今年棉花的亩产量很低。

We learned the population mean was that mu letter.

我们了解到人口均值是那个 mu 字母。

So minus mu K so the force of friction--- I'll just put force of friction.

所以减去 mu K 所以摩 --- 我只输入摩。

The force of friction is always mu K FN.

摩始终 mu K FN。

So pi mu is what we're working on.

所以π是我们正在研究的西。

One mu equals roughly 0.067 hectares.

一亩约等于 0. 067 公顷。

" mu" " k" times " Fn" and the " mu" " k"

" mu" " k" 乘以 " Fn" 并且 " mu" " k" 将是 0.

Times mu squared times the sum from i equals 1 to n.

乘以 mu 的平方乘以 i 等于 1 到 n 的总和。

So the mu squared term just gets factorized out.

所以 mu 平方的项刚好被分解了。

And actually, we could have just left the mu squared there.

实际上，我们本以将 mu 平方留在那里。

I've got a mu squared term in here, and I've got two things that go in there.

我这里有一个 mu 平方项，我有两样西。

I'm interested in understanding this as a function of mu.

我有兴趣将其理解 mu 的函数。

And let's see, minus 2 times mu-- sorry, that mu doesn't look good.

让我们看看，减去 2 乘以 mu-- 抱歉，mu 看起来不太好。

So this is the Greek letter mu, and we put this k here for kinetic, or we can kind of say moving friction.

k表示" 动" (kinetic)该系数等于摩的大小。

Similarly, the expected value for  our sum of size 3 is 3 times mu and so on and so forth.

同样，大小 3 的总和的预期值 mu 的 3 倍，依此类推。

And so, if I wanted to learn mu, all I need to know is X bar.

所以, 如果我想学习mu, 我所需要知道的就是X bar。

Fx bar given mu and sigma squared.

Fx bar 给定 mu 和 sigma 平方。

In  other words, the coefficient of friction, mu, is a ratio of the maximum force  of friction and the force normal.

换句话说，摩系数 mu 是最大摩与法向之比。

I.e., sigma naught squared goes out to infinity, we're going to come up with a variance for mu given x bar.

即，sigma naught squared 走向无穷大，我们将得出给定 x bar 的 mu 的方差。

This has nothing to do with mu.

这与你无关。