show that:
Var(x)=[1/(n+1)]*sum of (x^2) - [n/(n-1)]*X^2 (X is mean)
數學問題一問,thx
2007-09-22 3:58 am
回答 (1)
2007-09-25 6:44 am
✔ 最佳答案
First, you have a typo in your question, the correct question should be:Var(x)=[1/(n-1)]*sum of (x^2) - [n/(n-1)]*X^2 (X is mean)
Notice the minus sign above, here below is the proof:
圖片參考：http://i187.photobucket.com/albums/x22/cshung/7007092103169.jpg
收錄日期: 2021-04-23 17:18:26
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20070921000051KK03169