At half past ten, the third coach appeared.
He is also a rat extermination internet celebrity.
He claims to be the founder of Xiaoyao Bow.
Famous for his speed, he can shoot eight mud balls within ten seconds, and all of them hit moving targets within ten meters.
This is quite interesting!
Zeng Qi specially clicked on his short video, and he was so accurate in catching mice.
The fourth and fifth coaches are a couple, and their hobby is shooting.
Unfortunately, Zeng Qi didn't like it. The slingshot they used was a police dog slingshot with laser aiming.
Zeng Qi thought it was not suitable for him, so he finally took a fancy to coaches No. 1 and No. 3, the Xiaoyao Bow, which was a straight line between three points and was more suitable for him.
After paying the tuition, the next step is target practice.
Zeng Qi believed that before going abroad, he had to break ten rubber bands to be considered a graduate.
The goal is to hit the target at 20 meters!
Why twenty meters? That's because the aftermath of a mercury fulminate explosion is about the same as a grenade, and he estimated that he wouldn't be accidentally injured at twenty meters.
"Lao Zeng, please don't get hurt. You haven't played enough games with me yet. Hang in there, I will use my own method to save you!"
Under the moonlight, the boy's clothes were soaked with sweat, and he seemed to have found the feeling of practicing shooting in the game.
For the entire day, he did nothing but simple target practice.
The coach in charge of the instruction was very happy, feeling that the money was so easy to make.
"I really hope this kid progresses more slowly!"
Looking at the 8,000 Chinese Yuan that had just arrived on their mobile phones, Coaches No. 1 and No. 3 both smiled with satisfaction.
As evening approached, they began to laugh less.
The boy made something similar to a projector screen hanging in the air and drew a "cross" with a red pen.
The mud balls left holes in the curtain after penetrating it.
Then the guy started counting the holes with his phone...
After wasting two thousand mud pills, Zeng Qi was no longer able to achieve shooting accuracy at a distance of twenty meters.
For targets the size of beer bottles, the success rate is close to 90%.
If you change the target to a bucket-sized one, you will never miss it.
"How did you do it?" the two coaches asked in surprise.
If you ask yourself, it took them several years to achieve what they have today.
Unlike the young man in front of me, he improved his accuracy to this level in just one day.
Ever since the boy used the curtain as a bull's-eye, his behavior has become strange.
As if it was premeditated.
Putting away the slingshot, Zeng Qi wiped the sweat from his face. He was wondering whether to tell the coach the truth.
Looking at the two coaches' eager eyes, Zeng Qi compromised and said, "I tried to use probability theory to improve my accuracy."
Seeing that the two still didn't understand, Zeng Qi explained vividly: "Suppose my slingshot fires the same batch of clay pellets under the most consistent conditions, we will probably find that the final landing point of each clay pellet will still have a slight deviation. I call this deviation projectile dispersion."
The two nodded to show that they understood and you can continue.
Zeng Qi: "Projectile dispersion is inevitable, and there are many reasons for it. For example, the tension in the rubber band during each shot, the cleanliness of the leather bag, the slight differences in the ball's up and down and left and right movements, the ball's mass, temperature, and humidity, etc., all make it impossible for the bull's eye to land in the same position every time."
It sounded plausible, and with a slight frown on their brows, the two coaches tried to keep their minds in tune.
Zeng Qi: "If I only calibrate my shooting based on the accuracy of one shot, it would basically be like a blind man touching an elephant.
It's very likely that it wasn't my aim that was wrong, but rather the dispersion of the projectile that caused the mud pellet to miss the target."
"Yes, we want to know how you did it." The two coaches asked again.
Zeng Qi smiled and said, "Although the dispersion of the projectiles is random, as I continue to increase the number of mud balls I shoot, I will find that more of them will fall around a certain point.
The farther away from this point, the sparser the landing points of the Niwan will be.
According to statistics, random errors are the result of the combined influence of many small, independent random factors, and these random errors all obey the normal distribution law.
"Stop! Are you trying to teach us?" Coach No. 3 felt that his brain could not keep up with the beat.
"Young man, keep it simple and say something I can understand." Coach No. 1 said with deep sympathy.
Zeng Qi pouted and had to explain in words he thought people could understand:
"To improve accuracy, I resorted to probability theory. The normal distribution has several characteristics. First, random errors always occur within a certain range, and there won't be any particularly outrageous results.
I was aiming at the screen, but the mudball hit me in the face. This kind of outrageous result couldn't have been caused by a random error."
"Young man, keep it simple." The two coaches couldn't help but remind him.
Zeng Qi said helplessly: "I use this slingshot under similar conditions to shoot a hundred mud balls, and the impact point will form an ellipse on the curtain.
The density of impact points should be roughly symmetrical along the major and minor axes of the ellipse, and the closer to the center of the ellipse, the denser the impact points.
In order to measure the accuracy of the Niwan, I need to introduce you to the concept of median error, which is the absolute value of the random error. When the probability of it being less than a certain value is equal to half, this value is called the median error.
"Stop! Goodbye!" Coach No. 1 couldn't stand it anymore. He only had a junior college education, and those who didn't know him would think he was a college student.
"Go on, I want to see what you can say." Coach No. 3 was a college student. He vaguely remembered that he had only learned probability theory in college.
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