A.对每一个ξi(i=1,2…)都满足切贝谢夫不等式 B.ξi(i=1,2…)都不满足切贝谢夫不等式的条件 C.ξ1,ξ2,…满足大数定律 D.ξ1,ξ2,…不满足大数定律的条件
A.Eξ=Eη=1.5 B.Eξ=Eη=7/12 C.Dξ=Dη=11/144 D.D(ξ+η)=11/72
A. B. C. D.
A.E(η-Eη)(ξ-Eξ) B.E(ξ-Eξ)·E(η-Eη) C.E(ξη)2-(Eξ·Eη)2 D.E(ξη)-Eξ·Eη
A.Eη=a B.Eη=0.la C.Dη=b D.Dη=0.1b