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作者 weian 在 PTT [ Math ] 看板的留言(推文), 共16則

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[其他] 請問一題期望值

[ Math ]17 留言, 推噓總分: +2

作者: jenshi - 發表於 2022/05/06 11:48(2年前)

1^F推weian: 最小號碼是6的組合有1種 (6, 7, 8, 9, 10)05/06 12:10

2^F→weian: 最小號碼是5的組合有5種 (5一定要取，6~10 5C4)05/06 12:11

3^F→weian: 最小號碼是4的組合有15種 (4一定要，5~10 6C4)05/06 12:11

4^F→weian: 最小號碼是3的組合有35種05/06 12:12

5^F→weian: (6*1 + 5*5 + 4*15 + 3*35)/(1+5+15+35) = 7/205/06 12:13

6^F→weian: 取五張卡片，要最小的號碼是6只能取到 6,7,8,9,1005/06 12:13

7^F→weian: 其他任何情形最小號碼都不會是605/06 12:13

8^F→weian: 依次把最小號碼組合數乘上最小號碼加權平均=期望值05/06 12:14

[國小]國小資優升學的速率問題

[ Math ]12 留言, 推噓總分: +4

作者: mmxmmxmmx - 發表於 2021/12/09 15:22(2年前)

1^F推weian: 應該是 200m / 5m/s = 40s; 40s * 4m/s = 160m12/09 15:45

4^F推weian: 甲乙面對面走40秒會剛好在離起點80公尺處碰面，而這12/09 15:48

5^F→weian: 40秒之間狗不斷跑動可以跑 40*4 = 160 公尺12/09 15:48

9^F推weian: 總距離200公尺，甲每秒前進2公尺乙前進3公尺，兩人12/09 22:12

10^F→weian: 每秒會互相接近5公尺。200公尺 / 5 公尺/秒 = 40秒12/09 22:13

11^F→weian: 意思是他們互相接近40秒剛好拉近200公尺，兩人相遇12/09 22:14

機率問題

[ Math ]6 留言, 推噓總分: +4

作者: pumajason - 發表於 2021/10/16 21:38(2年前)

1^F推weian: 1 - (400/1000)^5 ?10/16 22:29

Re: [中學] 條件機率

[ Math ]2 留言, 推噓總分: +1

作者: lllm - 發表於 2011/04/19 14:24(13年前)

2^F推weian:推這篇，我的邏輯也是這樣算的。04/19 23:03

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