Find all School-related info fast with the new School-Specific MBA Forum

It is currently 30 Jul 2014, 19:24

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.

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

A certain characteristic in a large population has a

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
Senior Manager
Senior Manager
avatar
Joined: 25 Jun 2009
Posts: 313
Followers: 2

Kudos [?]: 70 [0], given: 6

GMAT Tests User
A certain characteristic in a large population has a [#permalink] New post 08 May 2010, 10:57
1
This post was
BOOKMARKED
00:00
A
B
C
D
E

Difficulty:

  25% (medium)

Question Stats:

59% (01:40) correct 41% (00:46) wrong based on 70 sessions
A certain characteristic in a large population has a distribution that is symmetric about the mean m. If 68% of the distribution lies one standard deviation d of the mean, what percent of the distribution is less than m+d?

(A) 16%
(B) 32%
(C) 48%
(D) 84%
(E) 92%

OPEN DISCUSSION OF THIS QUESTION IS HERE: a-certain-characteristic-in-a-large-population-has-a-143982.html
[Reveal] Spoiler: OA
Kaplan Promo CodeKnewton GMAT Discount CodesVeritas Prep GMAT Discount Codes
CEO
CEO
User avatar
Status: Nothing comes easy: neither do I want.
Joined: 12 Oct 2009
Posts: 2793
Location: Malaysia
Concentration: Technology, Entrepreneurship
Schools: ISB '15 (M)
GMAT 1: 670 Q49 V31
GMAT 2: 710 Q50 V35
Followers: 176

Kudos [?]: 901 [0], given: 235

GMAT Tests User Reviews Badge
Re: Standard Deviation Question..! [#permalink] New post 08 May 2010, 11:01
nitishmahajan wrote:
A certain characteristic in a large population has a distribution that is symmetric about the mean m. If 68% of the distribution lies one standard deviation d of the mean, what percent of the distribution is less than m+d?
(A) 16%
(B) 32%
(C) 48%
(D) 84%
(E) 92%



IMO D, whats the OA

16%
________________________________________________ m+d
34%
________________________________________________ m
34%
________________________________________________ m-d

16%

since 68% lies one standard deviation from mean m, => 50% of 68% lies on either side as it is symmetric about m.
thus 16% lie below m-d and 16% lie above m+d

now below m+d = 16+34+34 = 84%
hence D
_________________

Fight for your dreams :For all those who fear from Verbal- lets give it a fight

Money Saved is the Money Earned :)

Jo Bole So Nihaal , Sat Shri Akaal

:thanks Support GMAT Club by putting a GMAT Club badge on your blog/Facebook :thanks

Get the best GMAT Prep Resources with GMAT Club Premium Membership

Gmat test review :
670-to-710-a-long-journey-without-destination-still-happy-141642.html

3 KUDOS received
Intern
Intern
avatar
Joined: 26 Sep 2012
Posts: 17
Followers: 0

Kudos [?]: 6 [3] , given: 1

Re: A certain characteristic in a large population has a [#permalink] New post 19 Jul 2013, 01:46
3
This post received
KUDOS
The right answer has been given earlier.

In a case like this, to outline the picture is the best way to understand the question stem. Please find the picture below.
I hope it helps.

Sorry for poor painting skills :)
Attachments

File comment: A certain characteristic in a large population has a
68 Distr.jpg
68 Distr.jpg [ 49.72 KiB | Viewed 2882 times ]

Expert Post
2 KUDOS received
Math Expert
User avatar
Joined: 02 Sep 2009
Posts: 18832
Followers: 3267

Kudos [?]: 22822 [2] , given: 2651

Re: A certain characteristic in a large population has a [#permalink] New post 19 Jul 2013, 01:57
2
This post received
KUDOS
Expert's post
A certain characteristic in a large population has a distribution that is symmetric about the mean m. If 68 percent of the distribution lies within one standard deviation d of the mean, what percent of the distribution is less than m + d ?

(A) 16%
(B) 32%
(C) 48%
(D) 84%
(E) 92%

Given that 68% lies between m-d and m+d, thus 32% lies out of this range.

Now, since the distribution is symmetric about m, then half of the 32%, so 16%, lies to the right of m+d. Therefore, 16% lies to the right of m+d, and hence 84% lies to the left of m+d, which means that 84% is less than m+d.

Answer: D.

Similar questions to practice:
the-lifetime-of-all-the-batteries-produced-by-a-certain-comp-101472.html
70-75-80-85-90-105-105-130-130-130-the-list-shown-consist-of-100361.html
the-standard-deviation-of-a-normal-distribution-of-data-is-99221.html
for-a-certain-exam-a-score-of-58-was-2-standard-deviations-b-128661.html
given-that-the-mean-of-set-a-is-10-what-is-the-range-of-two-141964.html

OPEN DISCUSSION OF THIS QUESTION IS HERE: a-certain-characteristic-in-a-large-population-has-a-143982.html
_________________

NEW TO MATH FORUM? PLEASE READ THIS: ALL YOU NEED FOR QUANT!!!

PLEASE READ AND FOLLOW: 11 Rules for Posting!!!

RESOURCES: [GMAT MATH BOOK]; 1. Triangles; 2. Polygons; 3. Coordinate Geometry; 4. Factorials; 5. Circles; 6. Number Theory; 7. Remainders; 8. Overlapping Sets; 9. PDF of Math Book; 10. Remainders; 11. GMAT Prep Software Analysis NEW!!!; 12. SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS) NEW!!!; 12. Tricky questions from previous years. NEW!!!;

COLLECTION OF QUESTIONS:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat

DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS ; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.


What are GMAT Club Tests?
25 extra-hard Quant Tests

Get the best GMAT Prep Resources with GMAT Club Premium Membership

Re: A certain characteristic in a large population has a   [#permalink] 19 Jul 2013, 01:57
    Similar topics Author Replies Last post
Similar
Topics:
6 Experts publish their posts in the topic A certain characteristic in a large population has a Walkabout 8 12 Dec 2012, 03:19
A certain characteristic in a large population has a girikorat 2 23 Oct 2006, 09:16
A certain characteristic in a large population has a kuristar 3 04 May 2006, 09:56
A certain characteristic in a large population has a dinesh8 5 30 Apr 2006, 19:33
A certain characteristic in a large population has a joemama142000 10 04 Feb 2006, 14:57
Display posts from previous: Sort by

A certain characteristic in a large population has a

  Question banks Downloads My Bookmarks Reviews Important topics  


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

Powered by phpBB © phpBB Group and phpBB SEO

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®.