| View previous topic :: View next topic |
| Author |
Message |
roy33
Guest
|
 Posted: Sat Sep 29, 2007 12:12 am Post subject: SD from Powerprep. |
 |
|
If d is the standard deviation of X,Y,Z.What is the standard deviation of X+5,Y+5,Z+5??
1--d
2--3d
3--15d
4--d+5
5--d+15
Guys I am totally confused about standard deviation.But I am getting a SD math in every powerprep exam.So,it likey to be there in the actual xam too..
Plss tell me how to solve this///
Regards.. |
|
| Back to top |
|
 |
|
|
ratindasgupta
Rising GMAT Star
Joined: 11 Jun 2007
Posts: 98
Thanks given: 0
Thanked 0 times in 0 posts
Location: Mumbai
|
| Posted: Sat Sep 29, 2007 12:37 am Post subject: Re: SD from Powerprep. |
|
|
| roy33 wrote: | If d is the standard deviation of X,Y,Z.What is the standard deviation of X+5,Y+5,Z+5??
1--d
2--3d
3--15d
4--d+5
5--d+15
Guys I am totally confused about standard deviation.But I am getting a SD math in every powerprep exam.So,it likey to be there in the actual xam too..
Plss tell me how to solve this///
Regards.. |
The answer is A.
Since the three numbers rise by exactly the same amounts their standard deviation will also be the same.
If you want to check on that, try calculating SD of (1,2,3) and (6,7,8). you'll get the same SD. i.e. 1.3/1.7 |
|
| Back to top |
|
|
|
|
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You cannot download files in this forum
|
|
"GMAT" and other GMAC™ trademarks are registered trademarks of the Graduate Management Admission Council™. The Graduate Management Admission Council™ does not endorse, nor is it affiliated in any way with the owner or any content on this website. The opinions expressed here are solely those of the author or those of the members of this website. Copyright © 2009 BTG Test Prep, LLC. Powered by phpBB.
|
|
