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作者 walkwall 在 PTT [ Math ] 看板的留言(推文), 共500則
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Fw: [問題] 跟條件機率有關的問題
[ Math ]15 留言, 推噓總分: +3
作者: sagwow - 發表於 2017/07/16 15:25(7年前)
1Fwalkwall: P(一紅)就不是0.4啦 後面都錯07/16 15:50
2Fwalkwall: 以往經驗 一紅與二紅的經驗分別為0.4 0.6 但兩者07/16 15:51
3Fwalkwall: 相加未必為1 只能解讀成二紅機率是一紅的1.5倍07/16 15:52
4Fwalkwall: 否則照你這樣說 0.6=P(二紅)=P(二紅∩一紅)+07/16 15:53
5Fwalkwall: P(二紅∩一綠)=0.4*0.8+0.6*0.3=0.5 豈不矛盾?07/16 15:54
6Fwalkwall: 若解讀為1.5倍後 可以算得P(一紅)=0.5 P(二紅)=07/16 15:55
7Fwalkwall: 0.5*0.8+0.5*0.7= 0.75 = 0.5的1.5倍07/16 15:56
8Fwalkwall: 因此答案依續為(一)0.85 (二)0.25 (三)0.407/16 15:58
11Fwalkwall: 我是把他解讀成 : 歷史所有碰到的紅燈中(包括1+2)07/16 20:28
12Fwalkwall: 有四成是一紅 有六成是二紅 這樣下去算的07/16 20:28
13Fwalkwall: 因為給定條件太多 只好猜原題題意是這種弱化方式07/16 20:30
14Fwalkwall: 需要另PO一篇嗎 XD?07/16 20:31
15Fwalkwall: 所以我的答案是對的嗎 我等等整理PO一下好了07/16 23:32
Re: [中學] 資優班考題
[ Math ]6 留言, 推噓總分: +2
作者: Loving5566 - 發表於 2017/07/16 08:47(7年前)
5Fwalkwall: 就依序 mod 質數平方上去07/16 12:47
[微積] 二重積分的問題
[ Math ]4 留言, 推噓總分: +2
作者: kevin63875 - 發表於 2017/07/15 18:53(7年前)
4Fwalkwall: (X-1)^2 + Y^2 <= 107/15 20:26
[中學] 不等式
[ Math ]16 留言, 推噓總分: +6
作者: JI1 - 發表於 2017/07/14 03:32(7年前)
8Fwalkwall: ................07/14 21:13
11Fwalkwall: 中研院....07/14 23:29
請問一題無限題型的解法,為何有問題
[ Math ]34 留言, 推噓總分: +13
作者: rfvbgtsport - 發表於 2017/07/12 16:49(7年前)
4Fwalkwall: XDDD 又提到這類有趣的玩意07/12 19:07
5Fwalkwall: 請參閱 wiki:無效證明 goo.gl/rbWMR607/12 19:10
6Fwalkwall: 每項證明都有其前提 雖不用特別提出 但忽略可是會07/12 19:11
7Fwalkwall: 證出這類奇奇怪怪的結果的07/12 19:12
[微積] 一題極限
[ Math ]8 留言, 推噓總分: +3
作者: hsnu310659 - 發表於 2017/07/10 19:48(7年前)
8Fwalkwall: 照樓上方法就好了 簡單說就是取log以後求極限07/10 21:37
Re: [中學] 四邊形角度問題
[ Math ]3 留言, 推噓總分: +2
作者: Vulpix - 發表於 2017/07/09 18:22(7年前)
1Fwalkwall: 光是算完打完 就值得推 XD07/09 19:23
[中學] 有關多項式的微積分
[ Math ]3 留言, 推噓總分: +2
作者: hau - 發表於 2017/07/09 01:19(7年前)
1Fwalkwall: 已知小於等於5 那f"最多3次 f""最多一次 帶進去07/09 02:18
[中學] 高中機率
[ Math ]5 留言, 推噓總分: +1
作者: J050056 - 發表於 2017/07/08 18:55(7年前)
1Fwalkwall: 15/36, 1/17, 同4/9不同5/9, 55/216, 0.14355607/08 20:20
3Fwalkwall: 我是算 (49896+19800)/41580007/09 02:06
4Fwalkwall: 阿錯了 是 (49896+19800)/48549607/09 02:06
[機統] 大學機率
[ Math ]10 留言, 推噓總分: +3
作者: how155031 - 發表於 2017/07/08 18:18(7年前)
2Fwalkwall: 覺得他意思是 要你用積分去算07/08 19:59
3Fwalkwall: 你們應該有教 Poisson Distribution 吧?07/08 20:25