As We Have Met Before Chapter 91

"This is the expectation and variance of the Poisson distribution, and from this we find..."

Finn Feng gently pushed open the public classroom h0u'me:n, walked in quietly, sat in the back row, and looked at the time. get out of class ended in half an hour.

There were two girls sitting in the back row of the classroom. They heard the slight sound of desks and chairs. They turned their heads and saw Finn Feng. Finn Feng hurriedly made a "shh" gesture, smiled at the two girls, and whispered Said: "Let me sit in class for a while."

The girls naturally had no objection. They discussed quietly for a while, looking at Finn Feng from time to time.

Finn Feng put down his schoolbag, wrapped the headphone cord and put it in his side pocket. He looked up and saw that he was talking about advanced mathematics. He happened to be taking advanced mathematics this morning, and he still had a book in his schoolbag. He took out the book. , spread out something like that, also turned to the section on Poisson distribution, and then took out his mobile phone.