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作者 ejnfu 在 PTT [ Math ] 看板的留言(推文), 共5則
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[中學] 機率問題
[ Math ]6 留言, 推噓總分: +3
作者: lengs - 發表於 2012/05/16 05:55(12年前)
5F推ejnfu:4就是看老大~老么中哪一個是不同性別05/16 20:30
[中學] 期望值
[ Math ]8 留言, 推噓總分: +1
作者: glmm - 發表於 2012/05/10 11:02(12年前)
4F推ejnfu:每次拿到一點的機率為0.4(60元+20元) 所以每次可拿05/10 19:10
5F→ejnfu:的點數之期望值為(1*0.4+0*0.6)=0.4(點)05/10 19:10
6F→ejnfu:所以期望值總次數為10/0.4=25(次)05/10 19:11
7F→ejnfu:第一行打錯 0.4的機率是60元+80元05/10 19:11
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