Probability

👨🏻‍🏫 學術台數學

[匿名]

2011-02-25 8:09 pm

If the expected value of a random variable X is E(X), then the expected value of X given that a certain event Y has occurred is = E(X)/P(Y), is this universally true or conditionally true or wrong? Please explain with prove if possible.

更新1:

To : 自由自在. Thanks for the reply and assume you are correct, can you please explain why myisland8132 used E(X)/P(Y) for calculation in question http://hk.knowledge.yahoo.com/question/question?qid=7011022401443?

回答 (1)

用戶9112

2011-02-26 5:15 am

✔ 最佳答案

http://img402.imageshack.us/img402/1222/24449478.png

圖片參考：http://img402.imageshack.us/img402/1222/24449478.png

2011-02-26 23:25:09 補充：
The link may be dead. See here:
http://i1090.photobucket.com/albums/i376/Nelson_Yu/11.jpg

2011-02-27 10:20:34 補充：
Please see the discussion here:
http://i1090.photobucket.com/albums/i376/Nelson_Yu/1-3.jpg

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收錄日期: 2021-04-23 23:22:42
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20110225000051KK00362

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