Jun 18 09:00 PM EDT  10:00 PM EDT Strategies and techniques for approaching featured GMAT topics. Tuesday, June 18th at 9 pm ET Jun 18 10:00 PM PDT  11:00 PM PDT Send along your receipt from another course or book to info@empowergmat.com and EMPOWERgmat will give you 50% off the first month of access OR $50 off the 3 Month Plan Only available to new students Ends: June 18th Jun 19 10:00 PM PDT  11:00 PM PDT Join a FREE 1day workshop and learn how to ace the GMAT while keeping your fulltime job. Limited for the first 99 registrants. Jun 22 07:00 AM PDT  09:00 AM PDT Attend this webinar and master GMAT SC in 10 days by learning how meaning and logic can help you tackle 700+ level SC questions with ease. Jun 23 07:00 AM PDT  09:00 AM PDT Attend this webinar to learn a structured approach to solve 700+ Number Properties question in less than 2 minutes.
Author 
Message 
TAGS:

Hide Tags

Intern
Joined: 23 Jun 2018
Posts: 31
Location: India
Concentration: Finance, Leadership
WE: Sales (Mutual Funds and Brokerage)

Given a list of 5 terms as: 5,10,15,20 and 25. A 6th Term X is added
[#permalink]
Show Tags
11 Nov 2018, 23:37
Question Stats:
40% (01:15) correct 60% (01:34) wrong based on 67 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
Official Answer and Stats are available only to registered users. Register/ Login.
_________________
If you liked my post, kindly give me a Kudos. Thanks. Krunali Gokani



Veritas Prep GMAT Instructor
Joined: 16 Oct 2010
Posts: 9326
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
11 Nov 2018, 23:45
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
Joined: 23 Jun 2018
Posts: 31
Location: India
Concentration: Finance, Leadership
WE: Sales (Mutual Funds and Brokerage)

Re: Given a list of 5 terms as: 5,10,15,20 and 25. A 6th Term X is added
[#permalink]
Show Tags
11 Nov 2018, 23:48
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. Krunali Gokani



Veritas Prep GMAT Instructor
Joined: 16 Oct 2010
Posts: 9326
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
12 Nov 2018, 00:20
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
Joined: 27 May 2012
Posts: 800

Re: Given a list of 5 terms as: 5,10,15,20 and 25. A 6th Term X is added
[#permalink]
Show Tags
09 Jan 2019, 04:30
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.
_________________



Math Expert
Joined: 02 Sep 2009
Posts: 55629

Re: Given a list of 5 terms as: 5,10,15,20 and 25. A 6th Term X is added
[#permalink]
Show Tags
09 Jan 2019, 04:35
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.
_________________



Manager
Joined: 28 Mar 2017
Posts: 57
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
09 Jan 2019, 05:21
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



Intern
Joined: 08 Dec 2018
Posts: 9
Location: India

Re: Given a list of 5 terms as: 5,10,15,20 and 25. A 6th Term X is added
[#permalink]
Show Tags
16 Mar 2019, 08:21
Bunuel wrote: 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. Why Option D is wrong ?



Veritas Prep GMAT Instructor
Joined: 16 Oct 2010
Posts: 9326
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
22 Mar 2019, 05:59
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. For more on SD, check: https://www.veritasprep.com/blog/2012/0 ... deviation/Responding to a pm: Quote: Why option D is wrong ? SD is minimised not by minimising the numbers but bringing them as close as possible to the average. Here, the average is 15. The option closest to the average is 15. Hence it is correct. Adding 10 instead will increase the SD. Check the link on the Veritas Prep blog I have mentioned above.
_________________
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 >




Re: Given a list of 5 terms as: 5,10,15,20 and 25. A 6th Term X is added
[#permalink]
22 Mar 2019, 05:59






