GMAT Question of the Day - Daily to your Mailbox; hard ones only

It is currently 20 Jan 2019, 13:55

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 in January
PrevNext
SuMoTuWeThFrSa
303112345
6789101112
13141516171819
20212223242526
272829303112
Open Detailed Calendar

Given a list of 5 terms as: 5,10,15,20 and 25. A 6th Term X is added

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

Hide Tags

 
Intern
Intern
avatar
B
Joined: 23 Jun 2018
Posts: 28
Location: India
Concentration: Finance, Leadership
WE: Sales (Mutual Funds and Brokerage)
CAT Tests
Given a list of 5 terms as: 5,10,15,20 and 25. A 6th Term X is added  [#permalink]

Show Tags

New post 11 Nov 2018, 22:37
2
00:00
A
B
C
D
E

Difficulty:

  55% (hard)

Question Stats:

33% (00:41) correct 67% (01:06) wrong based on 36 sessions

HideShow timer Statistics

Given a list of 5 terms as: 5,10,15,20 and 25. A 6th Term X is added in the list, what will be the value of X so that the standard deviation (S.D.) of the final list of 6 terms is minimum?

A - 20
B - 15
C - 30
D - 10
E - 0

_________________

If you liked my post, kindly give me a Kudos. Thanks.
b]Krunali Gokani[/b]

Veritas Prep GMAT Instructor
User avatar
D
Joined: 16 Oct 2010
Posts: 8795
Location: Pune, India
Re: Given a list of 5 terms as: 5,10,15,20 and 25. A 6th Term X is added  [#permalink]

Show Tags

New post 11 Nov 2018, 22:45
1
KrunaliG wrote:
Given a list of 5 terms as: 5,10,15,20 and 25. A 6th Term X is added in the list, what will be the view of X so that the standard deviation (S.D.) of the final list of 6 terms is minimum?

A - 20
B - 15
C - 30
D - 10
E - 0

Posted from my mobile device



SD is minimised by having maximum terms at the mean.
The mean of 5,10,15,20, 25 is 15.

So the new number should be 15 too so that the SD does not increase but in fact decreases to get the minimum SD.

Answer (B)

Note: When you post a question, please ensure that you write it verbatim. Also, use the standard format of putting down options (A) (B) etc. A - makes one think that the numbers are negative.

For more on SD, check: https://www.veritasprep.com/blog/2012/0 ... deviation/
_________________

Karishma
Veritas Prep GMAT Instructor

Learn more about how Veritas Prep can help you achieve a great GMAT score by checking out their GMAT Prep Options >

Intern
Intern
avatar
B
Joined: 23 Jun 2018
Posts: 28
Location: India
Concentration: Finance, Leadership
WE: Sales (Mutual Funds and Brokerage)
CAT Tests
Re: Given a list of 5 terms as: 5,10,15,20 and 25. A 6th Term X is added  [#permalink]

Show Tags

New post 11 Nov 2018, 22:48
VeritasKarishma wrote:
KrunaliG wrote:
Given a list of 5 terms as: 5,10,15,20 and 25. A 6th Term X is added in the list, what will be the view of X so that the standard deviation (S.D.) of the final list of 6 terms is minimum?

A - 20
B - 15
C - 30
D - 10
E - 0

Posted from my mobile device



SD is minimised by having maximum terms at the mean.
The mean of 5,10,15,20, 25 is 15.

So the new number should be 15 too so that the SD does not increase but in fact decreases to get the minimum SD.

Answer (B)

Note: When you post a question, please ensure that you write it verbatim. Also, use the standard format of putting down options (A) (B) etc. A - makes one think that the numbers are negative.



Thank you so much for such a brief solution!
And yes will take care of the note too, thank you for the guidance.
_________________

If you liked my post, kindly give me a Kudos. Thanks.
b]Krunali Gokani[/b]

Veritas Prep GMAT Instructor
User avatar
D
Joined: 16 Oct 2010
Posts: 8795
Location: Pune, India
Re: Given a list of 5 terms as: 5,10,15,20 and 25. A 6th Term X is added  [#permalink]

Show Tags

New post 11 Nov 2018, 23:20
KrunaliG wrote:
VeritasKarishma wrote:
KrunaliG wrote:
Given a list of 5 terms as: 5,10,15,20 and 25. A 6th Term X is added in the list, what will be the view of X so that the standard deviation (S.D.) of the final list of 6 terms is minimum?

A - 20
B - 15
C - 30
D - 10
E - 0

Posted from my mobile device



SD is minimised by having maximum terms at the mean.
The mean of 5,10,15,20, 25 is 15.

So the new number should be 15 too so that the SD does not increase but in fact decreases to get the minimum SD.

Answer (B)

Note: When you post a question, please ensure that you write it verbatim. Also, use the standard format of putting down options (A) (B) etc. A - makes one think that the numbers are negative.



Thank you so much for such a brief solution!
And yes will take care of the note too, thank you for the guidance.


Sure! Check out the link I have provided. You will find it useful.
_________________

Karishma
Veritas Prep GMAT Instructor

Learn more about how Veritas Prep can help you achieve a great GMAT score by checking out their GMAT Prep Options >

Director
Director
User avatar
D
Joined: 27 May 2012
Posts: 668
Premium Member
Re: Given a list of 5 terms as: 5,10,15,20 and 25. A 6th Term X is added  [#permalink]

Show Tags

New post 09 Jan 2019, 03:30
1
KrunaliG wrote:
Given a list of 5 terms as: 5,10,15,20 and 25. A 6th Term X is added in the list, what will be the view of X so that the standard deviation (S.D.) of the final list of 6 terms is minimum?

A - 20
B - 15
C - 30
D - 10
E - 0


Dear Moderator,
Just came across this question, the term "view" confused me a lot , then I realized it was meant to be " Value ", seems this is a typo. Hope you will look into this and do the needful. Thank you.
_________________

- Stne

Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 52296
Re: Given a list of 5 terms as: 5,10,15,20 and 25. A 6th Term X is added  [#permalink]

Show Tags

New post 09 Jan 2019, 03:35
stne wrote:
KrunaliG wrote:
Given a list of 5 terms as: 5,10,15,20 and 25. A 6th Term X is added in the list, what will be the view of X so that the standard deviation (S.D.) of the final list of 6 terms is minimum?

A - 20
B - 15
C - 30
D - 10
E - 0


Dear Moderator,
Just came across this question, the term "view" confused me a lot , then I realized it was meant to be " Value ", seems this is a typo. Hope you will look into this and do the needful. Thank you.

___________________
Edited. Thank you.
_________________

New to the Math Forum?
Please read this: Ultimate GMAT Quantitative Megathread | All You Need for Quant | PLEASE READ AND FOLLOW: 12 Rules for Posting!!!

Resources:
GMAT Math Book | Triangles | Polygons | Coordinate Geometry | Factorials | Circles | Number Theory | Remainders; 8. Overlapping Sets | PDF of Math Book; 10. Remainders | GMAT Prep Software Analysis | SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS) | Tricky questions from previous years.

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?
Extra-hard Quant Tests with Brilliant Analytics

Manager
Manager
avatar
B
Joined: 28 Mar 2017
Posts: 58
Location: Sweden
Concentration: Finance, Statistics
Re: Given a list of 5 terms as: 5,10,15,20 and 25. A 6th Term X is added  [#permalink]

Show Tags

New post 09 Jan 2019, 04:21
Please remove the - sign on the answer choices! They look like a negative sign

Posted from my mobile device
_________________

* * *
Wish my good luck for 700 before Christmas!
If you think my post provided any help, please give +1 kudos, it helps a lot! <3

GMAT Club Bot
Re: Given a list of 5 terms as: 5,10,15,20 and 25. A 6th Term X is added &nbs [#permalink] 09 Jan 2019, 04:21
Display posts from previous: Sort by

Given a list of 5 terms as: 5,10,15,20 and 25. A 6th Term X is added

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


Copyright

GMAT Club MBA Forum Home| About| Terms and Conditions and Privacy Policy| 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®.