作者ozjucka (JACK)
看板Grad-ProbAsk
标题[问题] 98东华企研统计
时间Thu Apr 30 01:48:54 2009
今年出了25题统计选择
有一题机率问题自己无法解出
题目是If a bag contains three white, two black, and four red balls
and four balls are drawn at random with replacement,
what is the probabilities that the sample contains just one white ball
given that it contains just one red ball ?
(1)36/125 (2)36/110 (3)27/125 (4)3/4
我自己好像猜3的样子
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1F：推 wotenjean:这题考试耗超久的....找不出答案....>_< 04/30 11:58