Re: [計量] 3題陳向東+1題機經請教

看板GRE作者albertcheng (我很皮)時間14年前 (2010/08/25 02:31)推噓3(3推 0噓 3→)

留言6則, 3人參與討論串2/3 (看更多)

※ 引述《tping (牆壁,眼睛,膝蓋)》之銘言： : 1. T is no more than 20 percent greater than the integer x, : and T is no smaller than a number 20 percent less than the integer x. : If T = 60, which of the following indicates the smallest possible : interval for x? : A. 40=<x=<80 : B. 48=<x=<75 : C. 48=<x=<72 : D. 50=<x=<78 : E. 50=<x=<75 因為他說是 smallest possible interval 嗎? 所以應該是要把等於去掉題目才對吧? : 答案是E，話說我推出 60*0.8<x<60*1.2 感覺C更小啊... : 2. If 55percent of a group of people have brown hair and 80percent of the same : group do not have red hair, what fraction of those who do not have brown hair : have red hair? : A: 4/9 題目問說在不是 brown hair 的人之中是 red hair 的分數沒有 brown hair 是 45%，有 red hair 的人是 20% 所以是 20% / 45% = 4/9 : 3. If the perimeter of a triangle is 18, then the length of one of the sides : CANNOT be : 答案是9，因為兩邊和=第三邊 : 可是我覺得另一個答案1也會造成同樣的情況(1+8=9)所以是題目錯了嗎?? 1、8.5、8.5 就成立了 : 4. A tennis game is played between two players. A player wins the game if he : wins three out of the total sets. : colA. probability that the match is decidedin the first three match : colB. 0.15 : 印度網答案給B 因為0.5*0.5*0.5=0.125<0.15 : 可是我覺得1.題目沒有給誰的勝率比較高 : 2.問誰贏，因為機率不同，A的答案也不同 : 請問大家有何看法? 這題應該不用管誰勝率高吧(我想) 就當作是兩邊勝率一樣不過我怎麼覺得好像要再乘二， 0.5*0.5*0.5*2=0.25 因為有兩種可能，A直落三 OR B直落三，留待高手解答XD -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 118.168.164.179

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