In a certain group of people,3/8 of the people are men,and 2
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In a certain group of people,3/8 of the people are men,and 2/3 of the men have brown eyes.If 3/4 of the people have brown eyes,then what fraction of the group are women whodo not have brown eyes?这不是条件概率的题呀,为什么我就是算不出正确的那个答案
3/8*2/3=1/4
这里有四分之一的人Brown,一共有四分之三,所以有1/2是女性
女性一共占5/8
所以不是Brown的女性占的是
1-1/2/(5/8)=1/5
不是棕色眼睛的占五分之一
再问: 可是答案是1/8怎么回事啊?
再答: 肯定是答案错了
你倒着算一下
7/8*5/8=35/64
完全跟题目中给的不是一样的数
这里有四分之一的人Brown,一共有四分之三,所以有1/2是女性
女性一共占5/8
所以不是Brown的女性占的是
1-1/2/(5/8)=1/5
不是棕色眼睛的占五分之一
再问: 可是答案是1/8怎么回事啊?
再答: 肯定是答案错了
你倒着算一下
7/8*5/8=35/64
完全跟题目中给的不是一样的数
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