Chapter 349

Chapter 352

Tuesday, afternoon.

Tsinghua No.5 teaching building, ladder classroom.

Seven or eight classes on this day every week are the time for junior students of mathematics college to study probability theory and mathematical statistics.

The teacher is Professor Fang, who is respected by them.

One minute before class.

Professor Fang walked slowly into the classroom with a thermos cup.

And then behind them, a young man who looked like they were about the same age came in.

Of course, that man is Cheng Nuo.

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

However, when they saw Cheng Nuo who came into the classroom did not go to his seat, but followed Professor Fang onto the platform, they began to feel a little wrong.

This guy It seems that they are not our classmates?

On the platform, Cheng Nuo took Professor Fang's USB flash disk out of his pocket and opened the multimedia. After that, there is a kind of board standing on the side of the platform.

Just then a minute passed and the bell rang.

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

Seeing all the students looking up to the platform, Professor Fang coughed softly, looked at Cheng Nuo, and opened his mouth to introduce.

"You must have seen this new face next to me. I'd like to introduce to you this new assistant, Cheng Nuo."

"In the next three months, he and I will be responsible for the teaching of probability theory and mathematical statistics."

Cheng Nuo?

The name

Under the stage, some people are confused, some people subconsciously stare big eyes.

That's because of surprise!

Cheng Nuo's name, to say, is a little famous in the whole Tsinghua campus, especially in the Institute of mathematics.

Of course, it hasn't reached the point where everyone knows everything about it.

Cheng Nuo is a man who does not like to show off.

Usually, because of the numerous tasks, it can be said that the classroom, the office and the library are on the three-point line. I'm afraid that one percent of the people who can recognize Cheng Nuo's face can not be counted as one percent of the people who know his name.

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

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

But in a word, Cheng Nuo, the new teaching assistant, is officially meeting with you.

"Now, I'd like to ask Assistant Professor Cheng Nuo to say something to you." Professor Fang winked at Cheng Nuo and clapped at the same time.

The group of students who didn't know Cheng Nuo clapped their hands. And the group of students who knew the details of Cheng Nuo, when they saw the people beside them applauded, they were all clapping.

All of a sudden, a burst of jubilation in the classroom, Pa Pa Pa Pa sound endless.

Cheng Nuo steps to the desk.

His hands were down in the air, squinting and enjoying it.

Audience Ah, bah! Students are also very cooperative to stop clapping.

Cheng Nuo looked around, then said with a smile, "I am very honored to be Professor Fang's teaching assistant. To tell you the truth, when I first received this task, I was very frightened."

"After all, my age is 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?

Are you a year younger than us?

I've seen those who pretend to be young, but I haven't seen those who pretend to be old!!

make complaints about the students who know the roots of Cheng Nuo.

"But!" Cheng Nuo continued, "when I learned that the job of teaching assistants is linked to personal academic level, so I naturally stand here."

All of them said, "well

This time, not only the group of people who knew Cheng Nuo's deeds, but also the students who didn't know Cheng Nuo felt that this guy Good to pretend!

Due to the limitation of class time, Cheng Nuo didn't publish some lengthy things like the speech of award-winning.

After saying something casually, Cheng Nuo finally cheered on the students.

"In short, I hope we can work together and make progress together in the next three months."

"I don't want you to be the worst student I've ever had!"

All of them said, "well

Speechless + 2!

Finally, in the eagerness of the students, Cheng Nuo walked off the platform after the speech, and almost one of the students was still in a confused state.

Indeed, this lecture speed, even for Tsinghua students, is also forced to obey!

Say rbq，rbq！

"Next, let teacher Cheng give you an example to understand the content of this lesson, and by the way, arrange a few in class exercises as a test for learning Cheng Nuo."With that, Professor Fang unscrewed the lid of the thermos cup, smacked the medlar water fiercely, and walked leisurely toward the door.

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

Here are some examples and exercises.

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

"Let's first look at an example of the combination of order statistics and order statistics sum, example 1, x1 Xn is a sample from a population whose distribution function is f (x), its density function is p (x), and its order statistic is x (1) ≤ X (n), their observed values are Y1 ≤ If 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. As for whether the students understood or not, it was their own business.

However, he is a little better. At least in some places that students think are difficult to understand, he repeatedly talks several times. Considering the progress of the course, he can only rely on their own efforts after class.

As for the classroom exercises, Cheng Nuo did not deliberately go out of what tricky topics.

Are based on the previous year's examination questions for a certain degree of adaptation.

At most, it's a little more difficult.

For example, let the density function of random variables (x, y) be: δ (x, y) = 14, y < x, 0 < x < 2; δ (x, y) = 0

question (1): calculate the marginal density functions δ x (x), δ y (y).

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

(3) Calculate z = 】

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