back to being a teacher

Chapter 57 Probability (please vote for recommendation)
Students' memories come and go quickly.

What happened at noon was basically forgotten in the afternoon.

But this did not prevent Fang Bai from planting a seed in their hearts. The name of this seed was patriotism.

Someone asked, what is patriotism?

Patriotism is patriotism. There is no such thing as patriotism. I love my motherland.

Some people say that the American people are also very patriotic.

They just feel that they are superior to the American people, so they are very proud, and thus act very patriotic.

But the pride of the Chinese people is engraved in their bones. This is called national pride.

We are proud to be born in China and grow up in China. No matter whether China is poor or rich, whether it is war or peace... we all love our country.

When Fang Bai had class in the afternoon, he held a coin in his hand.

He kept throwing it up and catching it in his hand.

into the classroom.

Look at the students in the classroom.

Then, under the watchful eyes of all the students, the coins in their hands are tossed and finally caught in their hands.

He looked at the student in front of him and asked: "Is the coin in my hand a head or a word?"

"Head!"

"Character!"

"Head!"

"It will be all right!"

The students below shouted.

Fang Bai directly revealed the answer in his hand: "It's a human head!"

"Oye!"

The students who shouted for their heads shouted in victory.

"Then do it again!"

Fang Bai threw a coin into the sky again, then looked at the students in front of him with a smile and continued to ask: "Heads or words?"

"Head!"

"Character!"

"Character!"

"Head!"

There are people who shout both answers.

Fang Bai did not insert any advertisements here, and once again revealed the answer directly.

"It's still a head!"

"what……"

"No!"

"Oye!"

The students were divided into two groups. Those who guessed correctly were very happy, while those who guessed wrong were helpless.

"Again!"

Fang Bai once tossed the coin in his hand.

Then he took it in his hand and continued to look at the student in front of him: "Head or word?"

"Let's take a head..."

"It must be a word, it must be a word this time!"

The voice that talks about the heads is already very small.

But as Fang Bai revealed the answer, the students sitting below discovered that the one facing up was still a human head.

"Again!"

"Again!"

"Let's do it again!"

"It's okay, let's do it again!"

The coin in Fang Bai's hand turned heads several times in a row.

"I don't believe it anymore!"

"It must be words this time!"

"There have been quite a few heads, and this one must be a character!"

"Character!"

"Character!"

"Character!"

By this time, all the students had shouted the word, and they were still shouting. With so many heads fired, almost all the students in the class thought that this one could no longer be There are heads...

Fang Bai smiled slightly and solved the mystery again.

Still a human head.

"This is impossible!"

"How could it be possible that all nine are human heads!"

"There must be something wrong with that!"

"Teacher Fang, you must be up to something!"

"That's it!"

The students below all shouted, they couldn't believe it, all nine of them were upside down.

"I have a ghost, what ghost do I have? The coin has a character on one side and a head on it, but I still threw it in front of you, what ghost can I have?" Fang Bai said angrily.

Then he put the coins in his hand on the table.

I picked up the chalk and wrote the word probability on the blackboard behind me.

"Today we are going to learn about probability!"

"Through the coin toss just now, I believe everyone already understands what this so-called probability is, right?"

Fang Bai asked, looking at the students in front of him with a smile.

The students shook their heads: "I don't know!"

Fang Bai took out the coin again: "Do you think that if I throw out heads every time, the probability of heads appearing is smaller the further back I throw?"

The students nodded.

"Who told you?"

Fang Bai asked with a smile.

"It's just... isn't this what it should be?"

"Yes, this is a matter of course!"

"Who else is there to tell us that this is normal!"

The students all used their own words to refute Fang Bai.

"That's it!"

"Look!"

Fang Bai threw the coin into the sky again, then caught it in his hand and asked the same question: "Head or word?"

"Well……"

"Head!"

"Character!"

"One of them anyway!"

The students couldn't guess either.

Fang Bai did not reveal the answer, but leaned his body on the podium and asked: "No matter what it is, it is either a word or a human head, right?"

The students nodded as a matter of course.

"Is the probability of heads and words appearing half or half?" Fang Bai asked again.

The students nodded again.

"In other words, the probability of the head and the word is both 50.00%, right?"

"Um……"

The students nodded.

"Look!"

Fang Bai opened his hand and revealed the coin in his hand: "Head!"

"Forehead……"

"No..." "Or a human head?"

"Human head?"

The students felt their heads were a bit big.

"continue!"

Fang Bai threw the coin into the sky again.

"Heads or words?!"

Fang Bai asked after catching the coin.

"Character!"

"Character!"

"Head!"

"Head!"

"It must be words this time!"

"No, human heads are also possible!"

Now the student seemed to understand what Fang Bai meant.

Fang Bai did not speak, but quietly watched the students making noise. After the students' noise was over, he said, "Think about it, what are the consequences of throwing this coin?"

"Two kinds, human heads or words!"

Huang Xiangyan, who was sitting at the front, said.

"That's right, there are only two results. So think about it, after I throw it for the second time, will it be affected by the result of the first throw?"

Fang Bai looked at the students in front of him with a smile.

All the students thought for a while and shook their heads.

"Then think about it again. When I throw it for the ninth time, will it be affected by the results of the first eight throws?"

Now some students faltered.

But the student whose head was spinning quickly reacted immediately: "No!"

"Why not?"

Fang Bai asked back.

"Because when a coin is thrown, there are only two results, heads or words. No matter what the result of the previous throw is, it will not affect the second throw. Even if the first eight throws are heads, the ninth The result of the first throw will only be a head or a word, and the possibility of both results is 50.00%!" The student who had previewed the text immediately replied.

"Yes, that's right, everyone applaud him!" Fang Bai shouted.

"Oh……"

"Clap clap clap!"

"Clap clap clap!"

The whole class applauded the student, but more people were booing.

"The results of each hand are independent, and we will always think that if the first eight hands are heads, the probability of the ninth hand being heads will be very small!"

"why?"

Fang Bai wrote nine halves on the blackboard.

"This is an illusion of thinking, and it is also inertial thinking!"

"What's the probability of winning first?"

Fang Bai pointed to the front half and asked.

"Half!"

The students answered in unison.

"Where's the second one?!"

Fang Bai pointed to the second half.

"Also one-half!"

The students continued.

"Needless to say, the third one is one-half, the fourth one is one-half..."

"All the way to one-half of the ninth!"

"Then multiply them!"

"Finally equal to 510 and one half!"

"In other words, the probability of getting nine kills in a row is only 510 in [-]!"

"but!"

Fang Bai worked out the answers while lecturing, and his tone suddenly rose at the end.

"Having eight kills in a row, does it have anything to do with the ninth kill?"

Fang Bai focused on drawing several strokes under the ninth half.

Only then did all the students understand what Fang Bai meant.

This time, everyone understood.

"No!!"

"Okay, let's open the book and study it formally. The chapter on probability..."

It starts with a coin game.

In this class, the students studied very seriously.

Fang Bai could also clearly feel that the students in his class were doing well in class, and everyone was listening attentively.

Until the end of get out of class.

Fang Bai looked at the classmates below with a smile: "In today's class, we learned about probability, so there is such a TV program abroad!"

"The content of the show is very simple, that is, you directly choose one of the three doors. There is a prize behind one of the doors. As long as you choose the door with the prize, you can get a reward of 100 million US dollars!"

"At this time, you chose one of the answers. The host told you that he could help you eliminate one answer and then asked you to choose again. Will you change the answer to the remaining one?"

"What do you think, should I change it or not?"

Fang Bai wrote three letters on the blackboard: A, B, C!

Then I crossed out the B!

"I don't think there is any need to change it. Since one of the answers has been eliminated, the remaining answers are either A or C, so the probability of A and C is both 50.00%!" Huang Xiangyan said.

"What the monitor said makes sense, and I think so too!"

"The monitor is right!"

"No, if this question is so simple, then wouldn't anyone be able to take away the 100 million?!"

"That's right, since it's a show, there must be risks, and there must be something wrong with this question!"

"If it's not 50.00%, what is it?"

"Think about it, I chose an answer. No matter whether the answer is right or wrong, answer B will be eliminated, which means that B is definitely wrong, and the answers must be A and C. Isn't this a 50.00% probability?"

The students argued endlessly, but Fang Bai did not speak out.

He knocked on the blackboard, and then said: "This question is treated as a class assignment. Everyone has to answer it, and then write down their own reasons. If you can write down the calculation process, that would be the best!"

　Many people are keeping books.

　　Because I write very slowly.

　　To be honest, writing a teacher's article like this is a waste of plot.

　　If you push it too fast, the plot will appear boring; if you write it too slowly, the plot will not develop.

　　I can only improvise side plots every day and make up my daily life.

　　Students will always go through a process of growth, just like I wrote more than 50 chapters, and only two weeks have passed...

　　Writing too fast is boring.

　　Just like many fantasy novels, the early stage is very exciting because the upgrade is very slow, but the later stage is like riding a rocket...

　　It's okay, I'm not pursuing results anyway, as long as someone is watching.

　　But I don’t have much recommendation for this book.

　　Qidian’s recommendations now are all based on follow-up reading, which is how many people read the updates every day.

　　I know that there are not many people who follow the update, and they are all keeping books.

　　It’s not a big problem. I’ll write it slowly and you can just read it slowly.

　　I don’t want to leave myself any regrets like Master did. No matter what, I want to finish writing everything I want to write.

　　Thank you Blade Elephant for the 100 reward.

　　There are also 2 monthly passes for Xiaocao’s Pride.

　　Now monthly votes are also worth being a fan, I just found out!

　　Wow, I still have to thank Old Thief Baiyun for his monthly pass, and Ling Xianren for his monthly pass...

　　Thank you, thank you.

　　
　
(End of this chapter)