Re: [問題] 台大商研97統計

看板Statistics作者jason31 (Happy all the time!!)時間17年前 (2009/02/18 11:50)推噓4(4推 0噓 1→)

留言5則, 2人參與討論串3/3 (看更多)

※ 引述《bluelazzy (加油!!)》之銘言： : ※ [本文轉錄自 Grad-ProbAsk 看板] : 作者: bluelazzy (加油!!) 看板: Grad-ProbAsk : 標題: [問題] 台大商研97統計 : 時間: Tue Feb 17 21:42:43 2009 : : 7. On average,20% of the emergency room patients at hospital are students. : In a random sample of four patients,what is the probability that three of them : are students? : 這題答案是d.0.0256 : 但是我算出來的答案是0.02326 不過沒有這個選項 : 可以麻煩高手幫忙解答一下嗎？謝謝！應該就是 C4取3乘上(0.2)^3再乘上0.8=0.0256 四個病人選三個病人要是學生學生機率是0.2 另一個不是學生的機率是0.8 -- Cause these are the days worth living These are the years we're given And these are the moments These are the times Let's make the best out of our lives... -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 140.119.234.204

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bluelazzy

02/18 23:05, , 1^F

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bluelazzy

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tew

02/18 23:21, , 3^F

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