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

It is currently 25 Oct 2014, 05:39

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

DS Q There is set of consecutive even integers. What is S.D?

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
Manager
Manager
avatar
Joined: 17 Sep 2011
Posts: 209
Followers: 0

Kudos [?]: 23 [0], given: 8

DS Q There is set of consecutive even integers. What is S.D? [#permalink] New post 31 Jan 2012, 01:28
There is a set of consecutive even integers. What is the Standard deviation of the set ?
1)There are 39 elements in the set.
2)The mean of the set is 382.

The answer to this question is A. Can someone explain the logic behind this ?
_________________

_________________
Giving +1 kudos is a better way of saying 'Thank You'.

1 KUDOS received
Senior Manager
Senior Manager
User avatar
Status: May The Force Be With Me (D-DAY 15 May 2012)
Joined: 06 Jan 2012
Posts: 292
Location: India
Concentration: General Management, Entrepreneurship
Followers: 1

Kudos [?]: 89 [1] , given: 16

Reviews Badge
Re: DS Q There is set of consecutive even integers. What is S.D? [#permalink] New post 31 Jan 2012, 02:10
1
This post received
KUDOS
Hi

In order to solve this problem we need to know the mean & the terms of the sample.

Statement A :
Gives us 39 consecutive even elements
Eg : 0,2,4,.....
To Compute SD
1. Compute the difference of each data point from the mean, and square the result of each
2. compute the average of these values, and take the square root

Which we can calculate easily from the given data

Thus statement A is sufficient

Statement B
Mean is 382 only gives us the mid point of the set but not the number of elements hence we cannot calculate the SD

Thus statement B is insufficient

Hope this helps
_________________

Giving +1 kudos is a better way of saying 'Thank You'.

Manager
Manager
avatar
Joined: 17 Sep 2011
Posts: 209
Followers: 0

Kudos [?]: 23 [0], given: 8

Re: DS Q There is set of consecutive even integers. What is S.D? [#permalink] New post 31 Jan 2012, 07:19
Thanks man
_________________

_________________
Giving +1 kudos is a better way of saying 'Thank You'.

Re: DS Q There is set of consecutive even integers. What is S.D?   [#permalink] 31 Jan 2012, 07:19
    Similar topics Author Replies Last post
Similar
Topics:
14 Experts publish their posts in the topic If Q is a set of consecutive integers, what is the standard CharuKapoor 9 28 Apr 2013, 07:30
1 If Q is a set of consecutive integers, what is the standard ruturaj 10 02 Jul 2011, 12:43
2 There is a set of consecutive even integers ajit257 7 28 Mar 2011, 18:35
2 Experts publish their posts in the topic There is a set of consecutive even integers. What is the Jinglander 3 10 Aug 2010, 07:20
5 Experts publish their posts in the topic If Q is a set of consecutive integers, what is the standard hogann 9 14 Oct 2009, 05:20
Display posts from previous: Sort by

DS Q There is set of consecutive even integers. What is S.D?

  Question banks Downloads My Bookmarks Reviews Important topics  


cron

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®.