試卷名稱:110年 - 110 國立高雄大學_碩士班招生考試_經營管理研究所(無組別):統計學#102198
年份:110年
科目:研究所、轉學考(插大)◆統計學
15. 20 white balls and 8 black balls were in a box, then John picks the ball form the box 4 times and does not put the picked ball back into the box each time. If we define random variable X as the number of black ball(s) picked, then Var ( X ) =
(A)
(B)
(C)
(D)