BREAKING: Target Test Prep releases Brand New 2026 On Demand GMAT prep course

Redeem

SD

This topic has expert replies
Post new topic Post Reply
Previous Topic Next Topic
Legendary Member
Posts: 876
Joined: Thu Apr 10, 2008 8:14 am
Thanked: 13 times

SD

by ketkoag » Fri Mar 27, 2009 1:29 am
A scientist recorded the number of eggs in each of 10 birds’ nests. What was the
standard deviation of the numbers of eggs in the 10 nests?
(1) The average (arithmetic mean) number of eggs for the 10 nests was 4.
(2) Each of the 10 nests contained the same number of eggs

OA: b
My question : Is SD=0 when we take the second case
Last edited by ketkoag on Fri Mar 27, 2009 7:19 am, edited 1 time in total.
Top
Source: — Data Sufficiency |
Legendary Member
Posts: 1799
Joined: Wed Dec 24, 2008 3:03 am
Thanked: 36 times
Followed by:2 members

by goelmohit2002 » Fri Mar 27, 2009 4:54 am
IMO....yes...."B" should be sufficient.

Just think of this way....std deviation is deviation of items from mean(i.e. average)...

Since all numbers are same...so there will be no deviation.

For the longer approach(which is not required here :-))...we can go via the usual calculation method of SD too...

Thanks
Mohit
Top

GMAT/MBA Expert

User avatar
GMAT Instructor
Posts: 16207
Joined: Mon Dec 08, 2008 6:26 pm
Location: Vancouver, BC
Thanked: 5254 times
Followed by:1268 members
GMAT Score:770

Re: SD

by Brent@GMATPrepNow » Fri Mar 27, 2009 8:08 am
ketkoag wrote:My question : Is SD=0 when we take the second case
Yes, the standard deviation will be zero
Brent Hanneson - Creator of GMATPrepNow.com
Image
Top
Post new topic Post Reply
• Page 1 of 1