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

It is currently 12 Jul 2014, 07:02

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

m22 #15

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
Senior Manager
Senior Manager
User avatar
Status: Current Student
Joined: 14 Oct 2009
Posts: 370
Schools: Chicago Booth 2013, Ross, Duke , Kellogg , Stanford, Haas
Followers: 13

Kudos [?]: 97 [0], given: 53

GMAT Tests User Reviews Badge
m22 #15 [#permalink] New post 27 Sep 2010, 13:44
00:00
A
B
C
D
E

Difficulty:

  5% (low)

Question Stats:

100% (02:55) correct 0% (00:00) wrong based on 2 sessions
If after a number was added to a set consisting of all distinct one-digit prime integers, the median of the set grew by 25%, which of the following cannot be the value of the number added?

A)4.8
B)5.0
C) sq. rt 29
D)7.7
E)49/4

Explanation: The original set was (2,3,5,7), Its median was 4. The median of the new set is 4*1.25 =5 Thus, the number added cannot be less than 5.

The correct answer is A.

Can someone explain? I may be misreading the question, but it does not say the set consists of all the signle digit prime numbers with no repeats. From the way it is worded: A number was added to a set that consists of single digit prime integers, couldn't that mean that {2,2,2,2,2} is an example of one such set, so is {7,7,7}?

I reasoned the lowest possible current median is 2 (if all 2's) and the highest possible current median is 7 (set of all 7's) so the new median would be between 2.5 and 8.75 (it does not say the number added had to be an integer) ...is this just a poorly worded question or am I reading too mcuh into it? Thanks
_________________

Get the best GMAT Prep Resources with GMAT Club Premium Membership

Current Student
User avatar
Affiliations: Volunteer Operation Smile India, Creative Head of College IEEE branch (2009-10), Chief Editor College Magazine (2009), Finance Head College Magazine (2008)
Joined: 25 Jul 2010
Posts: 471
Location: India
WE2: Entrepreneur (E-commerce - The Laptop Skin Vault)
Concentration: Marketing, Entrepreneurship
GMAT 1: 710 Q49 V38
WE: Marketing (Other)
Followers: 11

Kudos [?]: 79 [0], given: 24

GMAT ToolKit User GMAT Tests User
Re: m22 #15 [#permalink] New post 28 Sep 2010, 03:05
It can't be all 2's or anything because it means that the set has "all the 1 digit prime nos." At least that is how I immediately interpreted it. I'd suggest don't go into semantics it can get confusing when it isn't.
_________________

Kidchaos

http://www.laptopskinvault.com

Follow The Laptop Skin Vault on:
Facebook: http://www.facebook.com/TheLaptopSkinVault
Twitter: http://www.twitter.com/LaptopSkinVault

Consider Kudos if you think the Post is good
Unless someone like you cares a whole awful lot. Nothing is going to change. It's not. - Dr. Seuss

Moderator
Moderator
User avatar
Joined: 25 Apr 2012
Posts: 514
Location: India
Concentration: Marketing, International Business
GPA: 3.21
WE: Business Development (Other)
Followers: 11

Kudos [?]: 198 [0], given: 555

Re: m22 #15 [#permalink] New post 18 Mar 2014, 03:24
Michmax3 wrote:
If after a number was added to a set consisting of all one-digit prime integers, the median of the set grew by 25%, which of the following cannot be the value of the number added?


A)4.8
B)5.0
C) \sqrt{29}
D)7.7
E)49/4

Explanation: The original set was (2,3,5,7), Its median was 4. The median of the new set is 4*1.25 =5 [b]Thus, the number added cannot be less than 5.

[/b]


Hi Bunuel,

Got the above question today....I guessed this one and moved on

Can you elaborate the part in red...
_________________


“If you can't fly then run, if you can't run then walk, if you can't walk then crawl, but whatever you do you have to keep moving forward.”

Expert Post
1 KUDOS received
Math Expert
User avatar
Joined: 02 Sep 2009
Posts: 18507
Followers: 3190

Kudos [?]: 21313 [1] , given: 2544

Re: m22 #15 [#permalink] New post 18 Mar 2014, 04:15
1
This post received
KUDOS
Expert's post
WoundedTiger wrote:
Michmax3 wrote:
If after a number was added to a set consisting of all one-digit prime integers, the median of the set grew by 25%, which of the following cannot be the value of the number added?


A)4.8
B)5.0
C) \sqrt{29}
D)7.7
E)49/4

Explanation: The original set was (2,3,5,7), Its median was 4. The median of the new set is 4*1.25 =5 [b]Thus, the number added cannot be less than 5.

[/b]


Hi Bunuel,

Got the above question today....I guessed this one and moved on

Can you elaborate the part in red...


For the median of {2, 3, 5, 7, x} to be 5 (5 to be the middle term), x must be greater than or equal to 5. If x is less than 5, the median would also be less than 5.

Hope it's clear.
_________________

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

Intern
Intern
avatar
Joined: 20 Feb 2012
Posts: 10
WE: Consulting (Consulting)
Followers: 0

Kudos [?]: 1 [0], given: 8

CAT Tests
Re: m22 #15 [#permalink] New post 11 Jun 2014, 21:02
Got this question today and was confused that the stem does not limit the possibility of repeating the numbers in set, so median of the original set is not limited to 3+5=4. Do I understand the stem wrong?
Expert Post
Math Expert
User avatar
Joined: 02 Sep 2009
Posts: 18507
Followers: 3190

Kudos [?]: 21313 [0], given: 2544

Re: m22 #15 [#permalink] New post 12 Jun 2014, 03:41
Expert's post
htetzz wrote:
Got this question today and was confused that the stem does not limit the possibility of repeating the numbers in set, so median of the original set is not limited to 3+5=4. Do I understand the stem wrong?


Added word "distinct" there to avoid confusion:
"If after a number was added to a set consisting of all distinct one-digit prime integers, the median of the set grew by 25%, which of the following cannot be the value of the number added?"

Thank you for reporting this.
_________________

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: m22 #15   [#permalink] 12 Jun 2014, 03:41
    Similar topics Author Replies Last post
Similar
Topics:
4 M22 q15 Dauren 5 18 Dec 2008, 23:10
29 Experts publish their posts in the topic m22#30 ventivish 35 26 Nov 2008, 20:27
54 Experts publish their posts in the topic M22#16 ventivish 18 26 Nov 2008, 19:17
7 Experts publish their posts in the topic m22#3 ventivish 20 26 Nov 2008, 18:54
7 Experts publish their posts in the topic M22 #10 snowy2009 15 02 Oct 2008, 11:20
Display posts from previous: Sort by

m22 #15

  Question banks Downloads My Bookmarks Reviews Important topics  

Moderators: WoundedTiger, Bunuel



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®.