随机变量X的概率分布Y 表示 X 被 3 除的余数 ,则E(Y) = ______.
8/7
Howlong________they________(dig)theditch?
EachyearintheUnitedStates,manyblackteenagers_______ofschool,eitherbecausetheycannotkeepuportheyhavetoworktosupporttheirfamily.
Iwishyou________likethat.
Theterriblenoiseis______memad.
Inthefuture,more______shouldbeplacedontheeducationoftheyoung.