jj 340 tell me answear

qiuhua01234567 · 发表于 2012-1-11 11:27:13

340 V14个数s, t, u, v，下面哪组数的standard deviation跟它们一样？（s,t,u,v 就是字母，不是实际数）

1. |s|, |t|, |u|. |v|

2. 3s, 3t, 3u, 3v

3. s^3, t^3, u^3, v^3

4. 2s+2, 2t+2, 2u+2, 2v+2

hookem09 · 发表于 2012-1-11 11:28:36

I just posted in other thread, "standard deviation is basically the difference between each number. Say s t u v = 1, 2, 3, 4, the gap between each number is 1. If 3s, 3t, 3u, 3v, then 3, 6, 9, 12 and gap between each number increased to 3. The correct answer for number 4 is (|s|, |t|, |u|, |v|). Multiplication will increase the standard deviation "

Someone check if thats correct

jj 340 tell me answear

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