Chapter 352: Assistant Cheng's debut

Chapter 352
Tuesday, afternoon.
Tsinghua No. 5 teaching building, lecture hall.
The seven or eight classes on this day of the week are the time for the junior students of the School of Mathematics to study probability theory and mathematical statistics.
And the instructor 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 hall.
And behind them, a young man who looked about the same age as them walked in.
Of course, that person is Cheng Nuo.
Originally, the students thought that Cheng Nuo was a student who came to class with them. Perhaps it was just a coincidence that the reason why they walked in one after another with Professor Fang.
However, when they saw that Cheng Nuo, who had entered the classroom, did not walk to the seat, but followed Professor Fang to the podium, they began to feel a little bit wrong.
This guy... doesn't seem to be our classmate?
On the stage, Cheng Nuo took the USB flash drive that Professor Fang took out of his pocket and turned on the multimedia. Later, there was a patterned board standing on the side of the podium.
Just then one minute passed and the class bell rang.
In universities, there is no such thing as "classmates stand up and teachers are good".
Seeing all the students in the audience looked up at the podium, Professor Fang gave a light cough, looked at Cheng Nuo, and introduced.
"Presumably everyone has seen this new face next to me. Let me introduce to you, this one is my newly appointed teaching assistant, Cheng Nuo!"
"In the next three months, he will work with me to be responsible for the teaching of probability and mathematical statistics for the students."
Cheng Nuo?
The name...
Some people in the audience looked confused, and some people subconsciously opened their eyes.
That's because of surprise!
The name Cheng Nuo, speaking of it, is regarded as a small name on the entire Tsinghua campus, especially in the School of Mathematics.
Of course, it has not yet reached the point where everyone in the academy knows everything.
Cheng Nuo is a man who doesn't like to show off.
Usually, because of the many tasks, it can be said that it is basically a three-point line in the classroom, office, and library. The person who can recognize Cheng Nuo's face is probably not one percent of those who know his name. .
This is also the reason why everyone in the classroom did not recognize him the moment he entered.
In the classroom, half of the people were confused and half were surprised.
But in short, Cheng Nuo, the newly appointed teaching assistant, has officially met with everyone.
"Next, please ask Assistant Cheng Nuo to say something to everyone." Professor Fang winked at Cheng Nuo and applauded at the same time.
The students in the audience who didn't know Cheng Nuo clapped enthusiastically. And the group of classmates who knew Cheng Nuo's background applauded, and were embarrassed to see the people next to him, they all clapped.
Suddenly, there was a burst of joy in the classroom, with endless pops.
Cheng Nuo stepped to the table.
He pressed his hands down in the void and squinted, enjoying it all.
Audience...Ah! The students also stopped applauding very cooperatively.
Cheng Nuo looked around, then smiled and said, "It's a great honor to be Professor Fang's teaching assistant. To be honest, when I first received this task, I was terrified."
"After all, my age is considered young in this position. After all, I am not a few years older than everyone."
What is the age?
Are you really one year younger than us?
I have seen someone pretending to be tender, but I have never seen someone pretending to be old! !
Those classmates who knew Cheng Nuo's knowledge were silent in their hearts.
"But!" Cheng Nuo continued, "When I learned that the job of a teaching assistant is tied to my academic level, I stand here for granted."
Everyone: "..."
This time, not only the group of people who knew Cheng Nuo's deeds, but also the classmates who didn't know Cheng Nuo, felt that this guy is... so pretending!
Due to class time constraints, Cheng Nuo didn't publish any long-form comments like an acceptance speech.
After talking casually, Cheng Nuo finally cheered up the students.
"In short, I hope that in the next three months we will work together and make progress together!"
"I don't hope that you will become the worst student I have ever taken!"
Everyone: "..."
Speechless +2!
Finally, in the expectation of the students, Cheng Nuo, who had finished speaking, walked off the podium and sat in an empty seat in the first row.
On the podium, Professor Fang started his lecture.
"Next, we talk about statistics and their probability distributions. First of all, we..."
The mathematics teacher's profound meaning-light speed teaching Dafa!
As an old professor with more than 20 years of experience, Professor Fang has thoroughly understood it.
The content of the two chapters of the textbook can be easily handled by Professor Fang in 20 minutes.
Almost a student in the audience was still in a daze.
Indeed, even the students of Tsinghua University have to accept this lecture speed!
Say...rbq, rbq!
"Next, let Mr. Cheng give you a sample question to understand the content of this lesson. By the way, I will arrange a few practice questions in class, which will serve as a test for learning Cheng Nuo."
After speaking, Professor Fang unscrewed the lid of the thermos cup, swiped a sip of wolfberry water, and walked out the door at a leisurely pace.
Cheng Nuoqi stepped onto the stage 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 didn't come up with such a basic topic, then he should consider whether he should postpone his graduation by one year.
"Let’s first look at an example question combining order statistics and order statistics. Example 1, X1,..., Xn is a sample from a certain population. The distribution function of the population is F(x) and the density function is p (x), the order statistic of this sample is X(1)≤...X(n), their observation values ​​are y1≤...≤y(n), the density function g(yk) of X(k), then ..."
As a teaching assistant, Cheng Nuo is quite responsible.
Originally, the task he was responsible for was only talking. As for whether the students understood it, it was their own business.
However, he is a little better~EbookFREE.me~ At least in some places that students think it is difficult to understand, he repeats several times. The extra, considering the progress of the course, can only rely on their own efforts after class.
As for the practice questions in class, Cheng Nuo did not deliberately put up any tricky questions.
They are all adapted to a certain degree based on previous exam questions.
At most, it just slightly increased the difficulty.
For example: [Suppose 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) Are X and Y independent? Is it relevant?
(3)Calculate Z=……】
………………
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