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September27,2021
| 分布 | 分布列或概率密度 | 期望(E) ...
September08,2021
$$ (X,Y) \sim f(x,y), Z=X+Y, f\_Z(z)=\int\_{-\infty}^{+\infty}f\_X(x)f\_Y(z-x)dx = \int\_{-\infty}^{+\infty}f\_X(z-y)f\_...
September07,2021
二次分布$P{X=k}=C^k\_np^k(1-p)^{n-k}$记为$X \sim B(n,p)$ 泊松分布$P{X=k}=\frac{\lambda^k}{k!}e^{-\lambda}(k=0,1,\cdots;\lambda>0)...
August31,2021
$$ A \subset B,P(B-A)=P(B)-P(A) $$ $$ P(A \cup B) = P(A) + P(B) -P(AB) $$ $$ P(A\_1 \cup A\_2 \cup A\_3) = P(A\_1) + P...