what is the probability of three or more of them get the disease?"
更新1:
the answer is 53/512
F.5 PROBABILITY
2011-11-13 2:26 am
16. in an industry, the probability for a worker to get an occupational disease is 1/4 if five workers in this industry are chosen at random,
what is the probability of three or more of them get the disease?"
what is the probability of three or more of them get the disease?"
回答 (2)
2011-11-13 2:48 am
✔ 最佳答案
P(three or more of them get the disease)= P(three have disease) + P(four have disease) + P(five have disease)
(They are mutually exclusive events)
= 5C3 * (1/5)^3 * (1 - 1/5)^2 + 5C4 * (1/5)^4 * (1 - 1/5) + (1/5)^5
= 181/3125
參考: Prof. Physics
2011-11-15 10:41 pm
change 1/5 to 1/4 and you will get the correct answer
收錄日期: 2021-04-20 11:48:40
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20111112000051KK00706