Re: [計量] 計量問題想請教板友

看板GRE作者cassine (Savannah)時間15年前 (2010/09/15 17:53)推噓4(4推 0噓 1→)

留言5則, 4人參與討論串2/2 (看更多)

※ 引述《younes (Angel in Paris)》之銘言： : 1.If the assets of a certainmutuak fund dropped by 3.01 billion to 72.04 : billion, what was the approximate decrease in the fund's assets? : 答案是4% : 可是我怎麼解都解不出來= = 3.01/(3.01+72.04) * 100% : 2.If 55 percent of a group of people have brown hair and 80 percent of the : same group do not have red hair , what fraction of those who do not have : brown hair have red hair? : 這題答案是4/9 , 不過我看了詳解還是不太懂 : 另外我想請問這題算是條件機率嗎? 還是只是單純的比而已 : 謝謝棕髮的人：55% 非棕髮的人：45% 紅髮的人：20% 20%/45% = 4/9 -- ○ ____ _ _ _ _ ____ _ _ ____ _____ ____ 。 ★(_ _)( \( )( \/ )( ___)( \( )(_ _)( _ )( _ \ ｏ _)(_ ) ( \ / )__) ) ( )( )(_)( ) / ● ‧ (____)(_)\_) \/ (____)(_)\_) (__) (_____)(_)\_) ★ ｏ -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 140.120.31.137

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younes

09/15 18:04, , 1^F

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younes

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hohiyan

09/15 18:21, , 3^F

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