"I don't know exactly how many people have become zombies, but it's definitely indispensable." Liu Haihao's voice broke the silence, he glanced at Wang Le'er, who was a little pale in the rearview mirror, and thought to himself that this professional white-collar worker was probably frightened.

After a pause, Liu Haihao continued: "When the disaster happened, I happened to unload the goods at the freight distribution center, and there were still many people in the distribution center at that time, counting the stevedores and drivers, there were about one hundred and eighty in total, and I remember that about a dozen people turned into zombies at that time, and then launched an attack on the surrounding workers......

"I was sitting in the car, so I escaped!"

"So, out of a hundred or so people, nearly 10% of them have become zombies?" Su Ziyan's voice sounded.

"Miss Su is right, there were about 100 people at that time, and there were about eleven or twelve zombies in the first wave, which is almost 10 percent."

"Just call me Ziyan."

Hearing the title of "Miss Su", Su Ziyan subconsciously frowned, "Suppose the probability of zombie mutation is one percent, and the permanent population of the entire Binhe City is almost eight million, which means that in this wave of mutation, at least 800,000 people have become zombies?" ”

Zhang Wenming nodded affirmatively and added: "Among the eight million permanent residents, not counting the subordinate counties and cities, at least one and a half million live in the main urban area, in other words, there are now more than 150,000 zombies in the city!" If you count the secondary mutation after being bitten, the total number of zombies is even more! ”

Su Ziyan frowned after hearing this, and said, "If thirty out of a hundred people are attacked, then counting the zombies that have mutated at the beginning, there will be almost forty or fifty zombies who will become zombies!" ”

"Could that be the case that some people are attacked by zombies, but they don't become zombies?"

"We haven't encountered this situation in Ziyan, and we can't give an accurate judgment, but from the scene I saw in the freight distribution center, people who were attacked by zombies turned into zombies, and there seems to be no exception." Liu Haihao shook his head, but rejected Su Ziyan's statement.

Su Ziyan opened her mouth and didn't say anything.

"Doesn't that mean that half of the population will become zombies? Is there already a world of zombies in that city? Su Ziling's face turned white, and she said with a frightened expression.

"Yes, there are so many zombies in one riverside city alone, aren't there hundreds of millions of zombies in the country? Good boy, this time it's enough to bear! Jiang Yan's face trembled, and he said in surprise. The scene of zombies all over the mountains suddenly came to mind.

Su Ziyan's expression was also a little ugly, and she said in a low voice: "Assuming that the first wave of mutation rate when the apocalypse occurs is one percent, counting the secondary mutations that are bitten later, it is indeed half of it!" ”

Half of them have become zombies, which is a very heavy number!

In a trance, everyone lost confidence in the future.

"That's not right! It can't be counted that way! ”

Su Ziyan suddenly shook her head again.

"How?" Jiang Yan asked unexpectedly.

Su Ziyan said: "Don't forget, the end of the day happens at night, when most people should sleep at home, and isn't the house the best barrier?" ”

Without waiting for others to ask, she continued: "We can calculate, if the mutation rate of zombies in the first wave is 10%, in short, let's just calculate it at 10%, then what is the probability that someone in a family of two will become zombies?" 19%！ And the probability that neither of them will become zombies is 81%! So what about a family of three, the probability that someone in the family will become a zombie is 27.1%, and the probability that no one of them will become a zombie is 72.9%! ”

"Huh!" Jiang Yan was surprised, and seemed to hear some signs, "If you calculate it this way, the probability of a member of a family of four becoming zombies is ......"

“34.4%！” Su Ziyan added.

"Yes, 34.4%! Yes, in the middle of the night, everyone is sleeping, and the survival rate of a single family is still very high! ”

Zhang Wenming also reacted at this time and looked at Su Ziyan, "Ziyan, can you help me calculate what is the specific probability of a corpse transformation in a family of four?" ”

Su Ziyan nodded and thought for a while: "If it is a family of four, then the probability that one member of the family will become a zombie is 29.2%, the probability of two people becoming a zombie is 4.86%, the probability of three people becoming a zombie is 0.36%, the probability of the whole family becoming a zombie is 0.01%, and the probability that no one in the family becomes a zombie is 65.6%!" ”

"Ah, sister, how did you get so good at math?" Su Ziling asked in surprise. The other people in the car also looked at her with surprised eyes, Su Ziyan's calculation speed just now was indeed a little too fast.

Su Ziyan herself was also stunned, just now she just subconsciously calculated, and then reacted, and also felt that her speed was a little amazing, when did her calculation ability become so powerful, is this also a side effect of transformation?

You must know that although the probability calculation just now is not complicated, there is still some calculation in it, and it is impossible for ordinary people to get the answer through mental arithmetic in such a short period of time.

Zhang Wenming didn't stop at this topic, he diverted the topic and said: "A family of four, even if someone becomes a zombie, due to the isolation of the internal room, there is a high probability that someone will survive, plus there is a 65.6% probability that no one will become a zombie at all, then the total survival probability of a family of four will be more than seventy!" ”

"And the probability of survival for a family of two and a family of three is even greater, exceeding eighty percent and approaching eighty percent respectively! So, because it happens at night, it makes people who stay at home have a greater chance of survival? ”

Everyone reacted, just imagine, if the zombies broke out during the day, although the daytime made everyone have a faster reaction speed, but there are so many people in workplaces, shopping places, and entertainment venues, many times they can't find shelter in time, especially in the bustling shopping malls, waiting for them may be greater casualties.

Of course, it was precisely because it was night that the people in the collective dormitory suffered more damage. As long as one person becomes a zombie, it will be a disaster for everyone in the collective dormitory.

"To be exact, from a purely mathematical point of view, the short-term damage caused by this zombie apocalypse is indeed much smaller than imagined, but if the family unknowingly hears a noise outside and then opens the door, this is the real harm!"

When everyone heard this, they couldn't help but be silent, what was really terrible was the impact from the follow-up!