It is currently 22 Feb 2018, 00:22

Close

GMAT Club Daily Prep

Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track
Your Progress

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.

Close

Request Expert Reply

Confirm Cancel

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

If m, s are the average and standard deviation of integers a, b, c

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:

Hide Tags

Manager
Manager
User avatar
G
Joined: 15 Mar 2014
Posts: 128
Location: India
GPA: 3.5
WE: Operations (Telecommunications)
Premium Member CAT Tests
If m, s are the average and standard deviation of integers a, b, c [#permalink]

Show Tags

New post 12 Mar 2017, 19:49
2
This post was
BOOKMARKED
00:00
A
B
C
D
E

Difficulty:

  55% (hard)

Question Stats:

38% (00:39) correct 62% (00:46) wrong based on 34 sessions

HideShow timer Statistics

If m, s are the average and standard deviation of integers a, b, c, and d, is s > 0?

1. m > a
2. a + b + c + d = 0
[Reveal] Spoiler: OA

_________________

Hit +1 Kudos If you like my post! :)

1 KUDOS received
Manager
Manager
User avatar
S
Joined: 18 Aug 2014
Posts: 53
Location: India
GMAT 1: 740 Q49 V40
GPA: 3.11
Reviews Badge
Re: If m, s are the average and standard deviation of integers a, b, c [#permalink]

Show Tags

New post 12 Mar 2017, 20:11
1
This post received
KUDOS
STE 1: SD can +ve or 0. if all the elements in the set are 0 then SD will be zero otherwise a +ve value. given that m>a ie avg is greater than one element. all elements are not equal .Sufficient.

STE 2 : all the elements can be 0 or a negative value + a positive value. Not sufficient

Answer : A
_________________

Today's actions are tomorrow's results

Re: If m, s are the average and standard deviation of integers a, b, c   [#permalink] 12 Mar 2017, 20:11
Display posts from previous: Sort by

If m, s are the average and standard deviation of integers a, b, c

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  


GMAT Club MBA Forum Home| About| Terms and Conditions| GMAT Club Rules| Contact| Sitemap

Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne

Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.