Qiao Yi was almost scared!

She saw a car coming and suddenly braked suddenly! Several people suddenly rushed out! Suddenly, she picked up a black cloth bag and wrapped around Lu Weiwei's head and face! Then she dragged it into the car!

Everything happened so fast that the car had already driven away in just a few seconds!

Everyone who saw this scene nearby was shocked. He was openly abducted people in broad daylight, and no one dared to believe that such a thing would happen at the school gate.

"What should I do?...What should I do?! Yes, call the police! I want to call the police!..." Qiao Yi was so anxious that she cried and took out her cell phone to call the police in a panic, "...Why can't it be connected?!"

A kind person next to her reminded her: "The school has installed a signal shield, so you have to stay away to use your phone."

Signal shields can block mobile phone signals. Many schools have this type of equipment, mainly used in exam rooms to prevent students from cheating in exams.

However, Lanyang School has long used shielding devices, not only to prevent cheating, but also to prevent students from playing with their mobile phones and not learning.

Qiao Yi didn't have time to think about why the school was so strict. She ran forward desperately with her cell phone in her arms, panic and stumbled, and looked at her cell phone signal while running!

Finally, I ran to a place with a signal, called the alarm number, transferred to the headquarters and the division, and finally explained the situation to the operator!

The other party asked her: "Do you still remember the license plate number?"

"The license plate number is...yes..." Qiao Yi's mind was full of chaos, "It's Q3...no, Q6?..."

Tears were even more anxious, she couldn't remember!

"Q8103F." Zhen Zhu said from the side.

"It's Q8103F!" Qiao Yi immediately said to the other side of the phone.

"Okay, the police will arrive soon. Please wait in place and don't leave..."

"You must be quick! You must stop that car!" Qiao Yi cried.

After hanging up the phone, Qiao Yiqiqi stood by the roadside, anxiously looking at both sides, wishing she could see the police car appear in front of her immediately!

But I waited for a long time.

Maybe it was three to five minutes, maybe there was a quarter of an hour, she no longer had a concept of time, and she just felt that every minute and every second was extremely long!

Qiao Yi was anxious.

The cell phone ring suddenly rang, it was an unfamiliar number, so Qiao Yi answered the phone.

"I'm Lin Chen." The man's voice on the other end of the phone was extremely calm. "I already know the situation of Weiwei. The police are trying to intercept the car. Considering that the other party might be driving a vehicle with a license plate, you need to provide the model and color. Do you still remember?"

Lin Chen can't panic.

Once he panics, the person he urges to ask will only be even more panic!

"Remember!" Qiao Yi said hurriedly, "It's a gray SUV!"

"Do you remember the specific time when the incident happened?" Lin Chen asked.

The car's activity radius can be calculated by time, and interception and search can be performed more efficiently.

Qiao Yi was stunned when she heard this.

She only knew it was around 5 o'clock.

Both 4:50 and 5:10 fall into this category. It is nearly 20 minutes long, enough for a car to run twenty or thirty kilometers!

What if the alarm time is the basis?... In fact, it is not accurate, because she doesn't remember how long it took for her to find the signal!

"Do you still remember?" Lin Chen asked again, "The phone record shows that it was 5:09. How long has it been since the accident happened? One minute? Three minutes, or more?"

Qiao Yi was silent.

Vehicles passed by in front of her, and they were fast and slow. Cold sweat was leaching from her back.

If you make the wrong time, even if you only make one minute wrong, it may cause delays in the rescue!

"At 5:06." Zhen Zhu next to her suddenly said.

Qiao Yi looked at Zhen Zhu in surprise, "Do you remember the time?"

Zhen Zhu pointed to the bus stop not far away, "There are 4 buses here, and the departure interval of each bus is 30 minutes. When something happened, one bus just took the bus, and now another one passed. Assuming the initial time is 0, use the cumulative density function to find the waiting time in the middle,

P(Xminx)=1-(1-x/30)4,

Derivation can result in the probability density function of Xmin... and then use integrals to obtain it.

E(Xmin)=∫30/0x·p(x)dx=6,

It's 5:12 now, minus the average waiting time 6, and the incident time is 5:06."
Chapter completed!