A P(A) B P(B) C 1 D P(AB)

A 18 B 19 C 21 D 17

A X与Y不相关 B X与Y独立 C D(X-Y)=D(X)-D(Y) D D(XY)=D(X)D(Y)

A 13．4 B 13．2 C 8．4 D 13．3

A 2 B 3 C <img src="https://www.beizhujiaoyu.com/uploads/202208/164696705229021.png" width="16" height="34" />  D 1

A 0．4 B 0．5 C 0．2 D 0．6

A D(X+C)=D(X) B D(X-Y)=D(X)-D(y) C D(X+Y)=D(X)+D(y) D D(X-C)=D(X)

A P2 B (1-p)2 C 1-2p D P(1-p)

A <img src="https://www.beizhujiaoyu.com/uploads/202208/164697569316671.png" width="15" height="34" /> B <img src="https://www.beizhujiaoyu.com/uploads/202208/164697569773561.png" width="16" height="34" /> C <img src="https://www.beizhujiaoyu.com/uploads/202208/164697570343501.png" width="17" height="34" /> D <img src="https://www.beizhujiaoyu.com/uploads/202208/164697570659061.png" width="16" height="34" />