NEW HERE? LEARN MORE
closeclose
Last visit was: 25 Apr 2024, 19:27 It is currently 25 Apr 2024, 19:27
Decision Tracker
My Rewards
New posts
New comers' posts

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.
Go to My Error Log Learn more
Close
Request Expert Reply
Confirm Cancel

Is the standard deviation of the set (10-4x)

SORT BY:
Date
Kudos
Tags:
Poor Qualityx      
Find Similar Topics 
Show Tags
Hide Tags
User avatar
earnit
Manager
Manager
Joined: 06 Mar 2014
Posts: 166
Own Kudos [?]: 475 [5]
Given Kudos: 84
Location: India
Schools: ISB '16 INSEAD Jan '16 Tepper '16 Simon '18 (A)
GMAT Date: 04-30-2015
Send PM
Reviews Badge
Is the standard deviation of the set (10-4x) [#permalink] New post   06 May 2015, 14:10
2
Kudos
3
Bookmarks
00:00
A
B
C
D
E

Difficulty:

25% (medium)

Question Stats:

81% (01:32) correct 19% (01:38) wrong based on 31 sessions
Hide Show timer Statistics
Is the standard deviation of the set (10-4x, 10-2x, 10, 10+2x, 10+4x) greater than the greatest element of the set?

1) x>0
2) x<0

This Question is Locked Due to Poor Quality
Hi there,
The question you've reached has been archived due to not meeting our community quality standards. No more replies are possible here.
Looking for better-quality questions? Check out the 'Similar Questions' block below for a list of similar but high-quality questions.
Want to join other relevant Problem Solving discussions? Visit our Data Sufficiency (DS) Forum for the most recent and top-quality discussions.
Thank you for understanding, and happy exploring!
ShowHide Answer
Official Answer
D
User avatar
S
askhere
Manager
Manager
Joined: 12 Nov 2014
Posts: 64
Own Kudos [?]: 195 [1]
Given Kudos: 14
Send PM
Re: Is the standard deviation of the set (10-4x) [#permalink] New post   06 May 2015, 20:02
1
Bookmarks
See the attached table.
The given set is set of evenly spaced numbers. Its very easy to find the SD of evenly spaced numbers by drawing a table.
You will see that SD of this set is 2\(\sqrt{2}\) x

Statement 1 : When X > 0 10+4x is the greatest element of set S and you are comparing it with 2\(\sqrt{2}\) x . Obviously 10+4x is greater. Suff
Statement 2 : When X < 0 10 - 4x is the greatest element of set S and you are comparing it with 2\(\sqrt{2}\) x . Obviously 10- 4x is greater. Suff

Answer is D

Ambarish
Attachments

sd.jpg
sd.jpg [ 26.31 KiB | Viewed 6657 times ]

User avatar
L
KarishmaB
Tutor
Joined: 16 Oct 2010
Posts: 14823
Own Kudos [?]: 64923 [3]
Given Kudos: 426
Location: Pune, India
Send PM
Re: Is the standard deviation of the set (10-4x) [#permalink] New post   06 May 2015, 21:33
3
Kudos
Expert Reply
earnit wrote:
Is the standard deviation of the set (10-4x, 10-2x, 10, 10+2x, 10+4x) greater than the greatest element of the set?

1) x>0
2) x<0


First of all, note that this question is incorrect. You cannot have contradictory statements. Both statements should hold simultaneously. x cannot be less than 0 and greater than 0 at the same time.

That said, what is SD? It quantifies the amount of deviation from the mean. The deviations are 4x, 2x, 0, 2x and 4x. The standard deviation will certainly be less than the highest deviation which is 4x. So in any case, 10 + 4x will be greater than 4x (assuming x is positive).
User avatar
L
Bunuel
Math Expert
Joined: 02 Sep 2009
Posts: 92915
Own Kudos [?]: 619038 [1]
Given Kudos: 81595
Send PM
CAT Tests Forum Quiz Mode
Re: Is the standard deviation of the set (10-4x) [#permalink] New post   07 May 2015, 02:53
1
Kudos
Expert Reply
earnit wrote:
Is the standard deviation of the set (10-4x, 10-2x, 10, 10+2x, 10+4x) greater than the greatest element of the set?

1) x>0
2) x<0


This is a poor quality non-GMAT question.

Topic locked.
User avatar
ashutoshsh
Manager
Manager
Joined: 07 Mar 2016
Posts: 54
Own Kudos [?]: 167 [0]
Given Kudos: 163
Send PM
Re: Is the standard deviation of the set (10-4x) [#permalink] New post   24 May 2016, 12:27
Is the standard deviation of set (10-4x, 10-2x, 10, 10+2x, 10+4x) greater than the greatest element in the set?

1.) x<0
2.) x>0


Can u please tell me the question's difficulty level also.
Thanks
User avatar
D
Kurtosis
Current Student
Joined: 13 Apr 2015
Posts: 1436
Own Kudos [?]: 4548 [0]
Given Kudos: 1228
Location: India
Send PM
GMAT ToolKit User Reviews Badge
Re: Is the standard deviation of the set (10-4x) [#permalink] New post   24 May 2016, 13:36
ashutoshsh wrote:
Is the standard deviation of set (10-4x, 10-2x, 10, 10+2x, 10+4x) greater than the greatest element in the set?

1.) x<0
2.) x>0


Can u please tell me the question's difficulty level also.
Thanks


Topic merged. This is a poor quality question. Please search before posting. Thank you.

Rules for posting: rules-for-posting-please-read-this-before-posting-133935.html#p1092822

This Question is Locked Due to Poor Quality
Hi there,
The question you've reached has been archived due to not meeting our community quality standards. No more replies are possible here.
Looking for better-quality questions? Check out the 'Similar Questions' block below for a list of similar but high-quality questions.
Want to join other relevant Problem Solving discussions? Visit our Data Sufficiency (DS) Forum for the most recent and top-quality discussions.
Thank you for understanding, and happy exploring!
GMAT Club Bot
gmatclubot
Re: Is the standard deviation of the set (10-4x) [#permalink]
24 May 2016, 13:36
Moderator:
Bunuel
Math Expert
92915 posts

Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne
Main navigation
GMAT Resources
Partners
MBA Resources
www.gmac.com|www.mba.com | | GMAT Club Rules | Terms and Conditions