Chapter 352

Tuesday, afternoon.

Tsinghua No. 5 Teaching Building, Lecture Theatre.

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

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

One minute before class.

Professor Fang held a thermos cup and walked slowly into the lecture hall.

Behind them, a young man who looked to be about their age followed suit.

Of course, that person is Cheng Nuo.

Originally, the students thought that Cheng Nuo was a student who came to class with them, and the reason why he walked in with Professor Fang one after another may just be a coincidence.

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

This guy ...... Doesn't seem to be our classmates?

On the podium, Cheng Nuo took the USB flash drive that Professor Fang took out of his pocket and opened the multimedia. Then, there was a decent board standing on the side of the podium.

Just as a minute passed, the class bell rang.

In college, there is no such thing as "good classmates", "stand up", "good teachers" or anything like that.

Seeing that the students in the audience were all looking up at the podium, Professor Fang coughed lightly, looked at Cheng Nuo, and opened his mouth to introduce.

"I think everyone has seen this 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 will work with me to teach the course of probability theory and mathematical statistics. ”

Cheng Nuo?

The name......

Some people in the audience looked confused, and some people subconsciously widened their eyes.

That's because of surprise!

The name Cheng Nuo, speaking of which, is well-known on the entire Tsinghua campus, and even more so in the School of Mathematics.

Of course, it's not yet to the point where everyone in the math academy knows about it.

Cheng Nuo is a person who doesn't like to show off.

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

That's why the people in the classroom didn't recognize him the moment he entered.

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

But in short, Cheng Nuo, the newly appointed teaching assistant, can be regarded as officially meeting with everyone.

Next, I would like to ask Assistant Teacher Cheng Nuo to say a few words to you. Professor Fang gave Cheng Nuo a wink and applauded at the same time.

The group of students in the audience who didn't know Cheng Nuo applauded enthusiastically. And the group of classmates who knew the details of Cheng Nuo's guy saw that the people next to them applauded, and they were embarrassed, and they all applauded.

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

Cheng Nuo stepped to the podium.

He pressed his hands down in the void, squinted his eyes, and enjoyed it all.

The audience ...... The students also cooperated and stopped applauding.

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 scared in my heart. ”

"After all, I'm young in this position, after all, I'm not a few years older than everyone else. ”

What does it mean to be a few years older?

You're a year younger than us, right?

I've seen pretending to be young, but I've never seen pretending to be old!!

Those classmates who knew Cheng Nuo silently complained in their hearts.

"But!" Cheng Nuo continued, "When I learned that the job of a teaching assistant is linked to my academic level, I stood here as a matter of course. ”

Everyone: "......"

This time, not only the group of people who originally knew Cheng Nuo's deeds, but even the classmates who didn't know Cheng Nuo felt that this guy was ...... It's so pretending!

Due to class time constraints, Cheng Nuo did not give some long speeches like his acceptance speech.

After talking a little casually, Cheng Nuo finally cheered for his classmates.

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

"I don't expect you to be the worst class of students I've ever had!"

Everyone: "......"

Speechless +2!

Finally, in the ardent anticipation of the students, Cheng Nuo, who had finished speaking, stepped down from the podium and sat in an empty seat in the first row.

On the podium, Professor Fang began his lecture.

"Next, we will talk about statistics and their probability distributions, first of all, we will ......"

The math teacher's mystery - the speed of light lecture Dafa!

As a veteran professor who has been in the industry for more than 20 years, Professor Fang has thoroughly understood it.

The content of the two whole chapters of the textbook can be easily completed by Professor Fang in twenty minutes.

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

Indeed, even Tsinghua students have to be convinced of this lecture speed!

Say a ...... rbq，rbq！

"Next, let Mr. Cheng give you the use case questions to understand the content of this lesson, and by the way, arrange a few more practice questions in class, which will be regarded as a test for learning Cheng Nuo. ”

After speaking, Professor Fang unscrewed the cap of the thermos cup, smacked the wolfberry water fiercely, and walked out of the door with a leisurely pace.

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

There are several sample 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 is not good at such a basic topic, then he should consider whether he should delay graduation for one year.

"Let's start with an example problem that combines ordinal statistics and ordinal statistics, example 1, X1,... , Xn is a sample from a population with a distribution function of F(x) and a density function of p(x) and an ordinal statistic of X(1)≤... X(n), their observations are y1≤... ≤ the density function g(yk) of y(n),X(k), then ......"

As a teaching assistant, Cheng Nuo is quite responsible.

Originally, he was only responsible for speaking, and as for whether the students understood or not, it was their own business.

But he was a little better, at least in some places that he thought the students were incomprehensible, he repeated it a few times, and it was redundant, considering the progress of the course, he could only rely on their own efforts after class.

As for the practice questions, Cheng Nuo did not deliberately come up with any tricky questions.

They are all adapted to a certain extent from previous years' exam questions.

At most, it's a little bit more difficult.

For example, [Let the density function of the random variable (X,Y) be: δ(x,y)=1/4,y

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

(2) Q: Are X and Y independent?

(3) Calculate Z=......】

..................

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