緊急!!!) 機會率
回答 (2)
2009-11-03 6:22 am
✔ 最佳答案
A:P(無次品)
= (1 - 4%)^5
= 0.96^5
= (24/25)^5
= 7962624 / 9765625
=0.815372697
B:
P(有2個以下次品)
= P(無次品) + P(有1個次品)
= 0.815372697 + 5*(4%)(1 - 4%)^4
= 0.815372697 + 0.169869312
=0.985242...
2009-11-04 14:23:51 補充：
^ 即係次方,例如
2^2 = 2*2 = 4
3^4 = 3*3*3*3 = 81
Hope this help!
2009-11-04 6:01 am
^ 係指....??
收錄日期: 2021-04-21 22:04:56
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20091102000051KK01622