Re: [計量] 被搞昏頭了，求救
※ 引述《aggiemaxie (Maxie)》之銘言：
: If 55% of a group of people have brown hair and 80% of the same group do
: NOT have red hair, what fraction of those who do NOT have brown hair have
: red hair?
: from pp3....
: I got confused~@@
brown hair : 55% - > do not have brown hair : 45%
do not have read hair : 80% -> read hair : 20%
farction of those do not have brown hair have read hair
20%/45% = 4/9...答案是這樣嗎?
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上帝曾經說過 :
當一個人打你右臉的時候
你就要用日耳曼背橋摔壞它的左臉
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◆ From: 118.160.236.91
※ 編輯: bluecsky 來自: 118.160.236.91 (06/06 10:26)
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