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Yahoo!奇摩知識+ - 分類問答 - 教育學習 - 發問中
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工程機率問題~~有一種能使人吐露真言的老實藥
Nov 4th 2013, 16:58

有一種能使人吐露真言的老實藥，能讓90%有罪的嫌犯適當地被判出有罪。當然，有罪的嫌犯中有10%是被錯判無罪。而另一方面，有1%是被誤判的無辜者。如果從一群只有5%曾犯罪的嫌犯中選出一個，且藥物顯示他有罪的，則此人其實是無辜的機率為何?

答案:0.857%

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