来自金辉宇的问题
1.若P(A)>0,P(B)>0则正确的是()A.P(A∪B)=1B.P(A)+P(B)0P(B|A)=1则正确的是()A.P(A|B)=P(B)B.P(A)=P(B)C.P(B-A)=0D.P(A∪B)=P(B)4.设P(A)=0.2P(B)=0.6则正确的是()A.P(A∪B)=0.80B.P(A∪B)=0.68C.0.6≤P(A∪B)≤0.80D
1.若P(A)>0,P(B)>0则正确的是()
A.P(A∪B)=1B.P(A)+P(B)0P(B|A)=1则正确的是()
A.P(A|B)=P(B)B.P(A)=P(B)C.P(B-A)=0D.P(A∪B)=P(B)
4.设P(A)=0.2P(B)=0.6则正确的是()
A.P(A∪B)=0.80B.P(A∪B)=0.68C.0.6≤P(A∪B)≤0.80D0.68≤P(A∪B)≤0.80
5.若X~N(2,1)Y=2X+1则Y~()
A.N(4,5)BN(5,1)C.N(5,4)DN(5,2)
6.设X,Y相互独立,且X~N(3,2)Y~N(1,3)则错误的是()
A.E(X,Y)=3B.E(X-Y)=2CD(Y-X)=1D.(X+Y)=5
7.若P(A)=1/3,P(A|B)=2/3P(|A)=3/5时,则P(B)=()
A,1/5B2/5C3/5D4/5
填空:
1.若X~B(10,0.1)则D(X)=()
2.若X~B(10,0.1)则E(X)=()
1回答
2020-03-02 19:01