1. Mary who has entered a shopping centre which she has the probabilities that she will buy a carema, a mobile phone, or both are 0.15,0.18 and 0.11 respectively. What is the probability that she will buy:
a. either or both of the two items?
b. neither of the two items?
可唔可以詳細d講解下點樣做!?
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Statistics
2010-01-07 4:23 am
回答 (1)
2010-01-07 4:49 am
✔ 最佳答案
a) P(either or both of the two items)= P(buy a carema) + P(buy a mobile phone) + P(buy both)
= 0.15 + 0.18 + 0.11
= 0.44
b)P(neither of the two items)
= 1 - P( either or both of the two items)
= 1 - 0.44
= 0.56
2010-01-06 20:55:00 補充：
在此,兩者購買是一個獨立動作,已給出其機率 = 0.11
不能把(兩者購買)當成以下兩個動作的合成 : (Buy a carema , Buy a mobile phone)
收錄日期: 2021-04-21 22:01:04
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20100106000051KK01508