CSDN's support for mathematical formulas is indeed not as strong as Zhihu, so it can only be shown in the picture. Recently, python has put some of them mainly in mysql, and by the way, I have reviewed probability theory and mathematical statistics, aiming to study the essence, not to be too obsessed with derivation, to combine theory with reason for understanding, and to apply it quickly! Will be constantly updated...
1. The five major formulas include lightweight derivation:
1.1 Introduction of the five major formulas:
1.2 Application of the formula of the third condition: