概率問題 三人參加考試，它們取及格成績的概率分別是1/2，2/5，5/8。求其中最少一人考試合格的概率。
回答 (2)
2007-11-26 7:35 am
✔ 最佳答案
P(最少一人考試合格)=1 - P(三人都不及合格)
=1 - (1- 1/2)(1- 2/5)(1- 5/8)
=1 - (1/2)(3/5)(3/8)
=1 - 9/80
=71/80
2007-11-26 6:31 am
1/2 = 50%
2/5= 40% This is the least percentage of scores.
5/8= 62.5%
2/5= 40% This is the least percentage of scores.
5/8= 62.5%
收錄日期: 2021-04-24 08:13:23
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20071125000051KK05418