几率论各类基础分布指望和方差推导过程汇总

0-1分布 X X X~ b ( 1 , p ) b(1,p) b(1,p) E ( X ) = p ∗ 1 + ( 1 − p ) ∗ 0 = p E(X)=p*1+(1-p)*0=p E(X)=p∗1+(1−p)∗0=p E ( X 2 ) = 0 2 ∗ ( 1 − p ) + 1 2 ∗ p = p E(X^2)=0^2*(1-p)+1^2*p=p E(X2)=02∗(1−p)+12∗p=

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