已知随机变量X~B(6,0.4),则当η=-2X+1时,D(η)=( )A.-1.88 B.-2.... 问题详情:已知随机变量X~B(6,0.4),则当η=-2X+1时,D(η)=()A.-1.88 B.-2.88 C.5.76 D.6.76【回答】C知识点:统计题型:选择题...