设随机变量x~b(4,1⼀2),则e(x^2+1)=

设随机变量x~b(4,1/2),则e(x^2+1)=
2024-12-16 02:29:41
推荐回答(2个)
回答1:

回答2:

P(X≥1)=1-P(X=0)=1-C(20)*(p^0)(1-p)^2=1-(1-p)^2=3/4p=1/2p(y≥1)=1-P(Y=0)=1-C(30)*(p^0)(1-p)^3=7/8