Omnipotent Data

Chapter 352

Tuesday afternoon.

Tsinghua No. 5 teaching building, lecture hall.

The seven or eight classes on this day every week are the time for the third-year students in the School of Mathematics to take probability theory and mathematical statistics.

And the teacher is Professor Fang who is quite respected by them.

One minute before class.

Professor Fang took a thermos cup and walked slowly into the lecture theater.

And behind them, a young man who looked about the same age as them also walked in.

Of course, that person was Cheng Nuo.

Originally, the students thought that Cheng Nuo was a student who came to class with them, and it was probably just a coincidence that they came in one after another with Professor Fang.

However, when they saw that Cheng Nuo who entered the classroom did not go to the seat and sit down, but walked up to the podium with Professor Fang, they began to feel something was wrong.

This guy... doesn't seem to be our classmate?

On the podium, Cheng Nuo took the USB flash drive that Professor Fang took out from his pocket and opened the multimedia. Afterwards, there was a handsome Banban standing on the side of the podium.

Just then a minute passed and the class bell rang.

In college, there is no such thing as students stand up and teacher is good.

Seeing the students in the audience looking up at the podium, Professor Fang coughed lightly, looked at Cheng Nuo, and introduced.

I think everyone has seen the new face next to me. Let me introduce to you. This one is my newly hired teaching assistant, Cheng Nuo!

In the next three months, he and I will be in charge of teaching the courses of probability theory and mathematical statistics to the students.

Cheng Nuo?

the name...

Some people in the audience looked confused, while others subconsciously widened their eyes.

That's because of surprise!

The name Cheng Nuo,

Speaking of which, he is well-known on the entire Tsinghua campus, especially in the School of Mathematics.

Of course, it has not reached the point where everyone in the School of Mathematics knows everything.

Cheng Nuo was a person who didn't like to show off.

Usually, because of the many tasks, it can basically be said that the classroom, office, and library are three-point line. Those who can recognize Cheng Nuo's face are probably not even one percent of the people who know his name. .

This is also the reason why everyone in the classroom did not recognize him the moment he came in.

In the classroom, half of the people were confused and half were surprised.

But anyway, Cheng Nuo, the newly appointed teaching assistant, officially met everyone.

Next, I would like to ask Assistant Professor Cheng Nuo to tell you a few words. Professor Fang winked at Cheng Nuo and applauded at the same time.

The group of students who didn't know Cheng Nuo applauded enthusiastically. And the group of students who knew the details of Cheng Nuo, seeing the applause of the people around them, felt embarrassed and clapped their hands.

All of a sudden, there was a burst of jubilation in the classroom, and the sound of crackling was endless.

Cheng Nuo stepped forward to the podium.

He pressed his hands down and squinted his eyes, enjoying all this very much.

Audience... ah bah! The students also applauded in cooperation.

Cheng Nuo looked around, and then said with a smile, It's a great honor to be Professor Fang's teaching assistant. To be honest, when I first received this task, I was very apprehensive.

After all, my age is considered young in this position. After all, I am not a few years older than everyone.

What do you mean by how old you are?

You are obviously one year younger than us, okay?

I have seen someone pretending to be young, but I have never seen someone pretending to be old! !

Those students who knew everything about Cheng Nuo complained silently in their hearts.

But! Cheng Nuo continued, When I learned that the job of a teaching assistant is linked to my academic level, I took it for granted that I stood here.

Everyone: ...

This time, not only the group of people who knew Cheng Nuo's deeds before, but even the students who didn't know Cheng Nuo before thought that this guy... so pretentious!

Due to class time constraints, Cheng Nuo didn't make some long speeches like his acceptance speech.

After talking casually, Cheng Nuo finally cheered up the students.

In short, I hope we will work together and make progress together in the next three months!

I don't hope that you will become the worst class of students I have ever brought up!

Everyone: ...

Speechless +2!

Finally, amidst the eager anticipation of the students, Cheng Nuo walked off the podium after speaking and sat in an empty seat in the first row.

On the podium, Professor Fang began his lecture.

Next, let's talk about statistics and their probability distributions. First we...

Mysteries of Math Teachers - Lectures at the Speed ​​of Light!

As an old professor with more than 20 years of practice, Professor Fang has thoroughly understood it.

The contents of the two entire chapters of the textbook can be easily completed by Professor Fang in 20 minutes.

Almost one of the students in the audience was still in a dazed state.

Indeed, even Tsinghua students have to obey the speed of this lecture!

Say... rbq, rbq!

Next, I'll let Teacher Cheng give you some sample questions to understand the content of this lesson. By the way, I will also arrange a few in-class exercises, which will be used as a test for learning Cheng Nuo.

After speaking, Professor Fang unscrewed the cap of the thermos cup, took a sip of wolfberry water, and walked out the door with leisurely steps.

Cheng Nuo walked up to the podium just in time and opened another PPT in the folder.

It contains several sample questions and practice questions.

Cheng Nuo sent it to Professor Fang, but Professor Fang didn't read it in advance. In his words, if Cheng Nuo can't solve such a basic topic well, then he should consider whether he should delay graduation for one year.

Let's first look at an example of order statistics and order statistics combined. Example 1, X1,..., Xn is a sample from a population whose distribution function is F(x) and the density function is p (x), the order statistics of this sample are X(1)≤…X(n), their observed values ​​are y1≤…≤y(n), and the density function g(yk) of X(k), then ...

As a teaching assistant, Cheng Nuo was quite responsible.

Originally, the task he was responsible for was just to explain, as for whether the students understood it or not, that was their own business.

But he is a little better, at least in some places that the students think are difficult to understand, he repeats it several times, redundant, considering the progress of the course, they can only rely on their own efforts after class.

As for the exercises in class, Cheng Nuo didn't deliberately come up with any tricky questions.

They are all adapted to some extent from the exam questions from previous years.

At most, it is to increase the difficulty a little bit.

For example: [Assume that the density function of the random variable (X, Y) is: δ(x, y)=1/4, y﹤x, 0﹤x﹤2; δ(x, y)=0

Question (1): Find the edge density function δx(x), δy(y).

(2) Ask whether X and Y are independent? Is it relevant?

(3) Calculate Z=...]

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