Given that X is the mean of three positive numbers p,q and r,and the following are two sets of data.
A: p,q and r.
B:p/2,q/2,r/2
(a) Find the mean of set B (in terms of X).
(b) If a number of X are added in set A such that the standard deviation of set A is just equal to that of set B, how many data are therein set A now?
Standard deviation一問
2008-11-16 6:13 am
回答 (1)
2008-11-16 8:11 am
✔ 最佳答案
Explanation as follows:圖片參考：http://i238.photobucket.com/albums/ff245/chocolate328154/Maths549.jpg?t=1226765448
參考: My Maths Knowledge
收錄日期: 2021-04-26 13:10:54
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20081115000051KK02113