40% of people in a certain group are smokers.If 6 of them are selected at random ,find the probability that the number of smokers is
a)5
b)more than 4
ans:a)0.0369
b)0.0410
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要步驟
Mathematics and Statistics
2009-06-01 1:33 am
回答 (1)
2009-06-01 2:35 am
✔ 最佳答案
Using binomial distribution Bin(6,0.4)(a) P(5)=6C5(0.4)^5(0.6)=0.0369
(b)
P(X>4)
=P(5)+P(6)
=0.0369+0.4^6
=0.041
收錄日期: 2021-04-26 13:44:38
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20090531000051KK01380