Events & Promotions
|
|
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
Track
Your Progress
Practice
Pays
Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.
May 1408:30 AM PDT
-09:30 AM PDT
Most GMAT test-takers are intimidated by the hardest GMAT Verbal questions. In this session, Target Test Prep GMAT instructor Erika Tyler-John, a 100th percentile GMAT scorer, will show you how top scorers break down challenging Verbal questions..
May 1212:00 PM EDT
-11:59 PM EDT
Make the most of your break with the most realistic GMAT™ prep. Take up to $700 off select products.- May 13
08:30 AM PDT
-09:30 AM PDT
In Episode 4 of our GMAT Ninja CR series, we tackle the most intimidating CR question type: Boldface & "Legalese" questions. If you've ever stared at an answer choice that reads, "The first is a consideration introduced to counter a position that... - Jun 10
06:00 AM PDT
-06:15 PM PDT
Register for the GMAT Club Virtual MBA Spotlight Fair – the world’s premier event for serious MBA candidates. This is your chance to hear directly from Admissions Directors at nearly every Top 30 MBA program..
06 Nov 2016, 00:37
Kudos
Bookmarks
N
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
(N/A)
Question Stats:
100% (02:32) correct
0%
(00:00)
wrong
based on 6
sessions
History
Date
Time
Result
Not Attempted Yet
If 2 elements are dropped from setA {-18, -10, 0, 8, 10} what will be the % change in mean.
1) Median of the set remains same
2) The range of the set will decrease by 2
the Answer option given in my material is: Data insufficient
But I think the 1 and 2 are together important.
Reason:
Initial median is 0
Initial range: 28
Initial mean: -2
Statement 1: median doesnt change.
So median is still 0
Statement 2:
Range decreases by 2.
So -10 and 10 on either side of median are eliminated keeping Median "0" unchanged.
New set A1{-18,0,8}
New mean: -10/3
hence % change can be calculated.
WHERE AM I GOING WRONG?
1) Median of the set remains same
2) The range of the set will decrease by 2
the Answer option given in my material is: Data insufficient
But I think the 1 and 2 are together important.
Reason:
Initial median is 0
Initial range: 28
Initial mean: -2
Statement 1: median doesnt change.
So median is still 0
Statement 2:
Range decreases by 2.
So -10 and 10 on either side of median are eliminated keeping Median "0" unchanged.
New set A1{-18,0,8}
New mean: -10/3
hence % change can be calculated.
WHERE AM I GOING WRONG?
Archived Topic
Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Data Sufficiency (DS) Forum
Still interested in this question? Check out the "Best Topics" block below for a better discussion on this exact question, as well as several more related questions.
Thank you for understanding, and happy exploring!
06 Nov 2016, 02:08
Kudos
Bookmarks
sandeepkotla
Question: % change in Mean if two terms are dropped from set = ?
The answer depends on which two terms are dropped from the set
Statement 1: Median of set remains same
Current Media = 0
Media will remain same only if one term smaller than 0 and one term bigger than 0 is dropped.
But the terms to be dropped may be {-18, 10} or may be {-18,8} leading to the different final means hence different final values of % change in Mean. Hence
NOT SUFFICIENT
Statement 2: Range will decrease by 2
Current Range = 10-(-18) = 28
New Range = 26 which is possible only if the smallest term is -18 and highest term is 8 in the new set after dropping two terms
i.e. two terms to be dropped may be {-10,10} or {0, 10} leading to different values of new mean hence new % change in the mean. Hence,
NOT SUFFICIENT
Combining the two statements
One term less than 0 and one term greater than 0 to be dropped (as per statement 1)
10 is to be dropped and -18 is to be retained hence
New Set will be {-18, 0, 8}
i.e. new mean = -10/3 (a Unique value) i.e. % change in mean will be a unique value as well Hence
SUFFICIENT
Answer: option C
06 Nov 2016, 02:10
Kudos
Bookmarks
sandeepkotla
The highlighted part is the information of statement 1 which you are unintentionally using in statement 2 as well thereby leading you to incorrect answer choice
I hope this helps!!!
