|
Author |
Message |
|
SVP
Joined: 07 Nov 2007
Posts: 1842
Location: New York
Followers: 20
Kudos [?]:
291
[0], given: 5
|
ds - mode (m05q32) [#permalink]
 04 Sep 2008, 13:07
Question Stats:
66% (01:16) correct
33% (00:17) wrong based on 2 sessions
What is the value of X ? 1. X is a mode of [3, 0, 1, -1, 0, 5, 1]2. X is neither positive nor negative Source: GMAT Club Tests - hardest GMAT questions
_________________
Your attitude determines your altitude
Smiling wins more friends than frowning
|
|
|
|
|
|
|
|
|
Intern
Joined: 29 Jul 2008
Posts: 7
Followers: 0
Kudos [?]:
0
[0], given: 0
|
b.
st1 mode can be 0 or 1
st2 0 is the only number neither pos nor neg.
|
|
|
|
|
|
VP
Joined: 05 Jul 2008
Posts: 1442
Followers: 28
Kudos [?]:
152
[0], given: 1
|
x2suresh wrote: What is the value of X?
X is a mode of [3, 0, 1, -1, 0, 5, 1]
X is neither positive nor negative
X is a mode of [3, 0, 1, -1, 0, 5, 1] mode is 0 and 1 . Lets NOT avg them like we do for finding the median of set aka bi modal. So X = 0,1 there can be sets with more than 2 modes and no mode at all. Insuff Only one value such that its not +ve or -ve ie 0 Suff Hence B
|
|
|
|
|
|
SVP
Joined: 07 Nov 2007
Posts: 1842
Location: New York
Followers: 20
Kudos [?]:
291
[2] , given: 5
|
2
This post received
KUDOS
OA is B. thanks for the replies.
_________________
Your attitude determines your altitude
Smiling wins more friends than frowning
|
|
|
|
|
|
VP
Joined: 17 Jun 2008
Posts: 1411
Followers: 6
Kudos [?]:
75
[1] , given: 0
|
1
This post received
KUDOS
x2suresh wrote: What is the value of X?
X is a mode of [3, 0, 1, -1, 0, 5, 1]
X is neither positive nor negative
Statement (1) ALONE is sufficient, but Statement (2) ALONE is not sufficient
Statement (2) ALONE is sufficient, but Statement (1) ALONE is not sufficient
BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient
EACH statement ALONE is sufficient
Statements (1) and (2) TOGETHER are NOT sufficient (1) has 1,0 as mods INSUFFI (2) 0 is the only number neither +ve nor -ve SUFFFI IMO B
_________________
cheers
Its Now Or Never
|
|
|
|
|
|
Intern
Joined: 17 Mar 2010
Posts: 39
Followers: 2
Kudos [?]:
54
[0], given: 26
|
Re: ds - mode (m05q32) [#permalink]
27 May 2010, 03:50
what does mode mean ?
_________________
If my post helped you : KUDOS KUDOS KUDOS
|
|
|
|
|
|
Current Student
Joined: 31 Mar 2010
Posts: 167
Schools: Tuck Class of 2013
Followers: 2
Kudos [?]:
12
[0], given: 4
|
Re: ds - mode (m05q32) [#permalink]
28 May 2010, 08:51
leilak wrote: what does mode mean ? http://en.wikipedia.org/wiki/Mode_(statistics) "In statistics, the mode is the value that occurs the most frequently in a data set or a probability distribution."So from (1), the mode is either 0 or 1 since both have two occurrences.
|
|
|
|
|
|
Manager
Joined: 17 Apr 2010
Posts: 114
Followers: 1
Kudos [?]:
33
[0], given: 12
|
Re: ds - mode (m05q32) [#permalink]
03 Aug 2010, 11:08
Hi Guys,
Could you please advise what the answer would be in the below case?
A small change done to the actual question ( removed the zeros from the option 1)
What is the value of ?
1. is a mode of [3, 1, -1, 5, 1]
2. is neither positive nor negative
In this case , will the answer be
D ( X would be 1 based in option 1 AND 0 based on the option 2)
or
E ( eventhough X value is determined in both the cases , the values are different)
Kindly post your explanation
Thanks,
Raju
|
|
|
|
|
|
Manager
Joined: 15 Apr 2010
Posts: 200
Followers: 3
Kudos [?]:
14
[0], given: 29
|
Re: ds - mode (m05q32) [#permalink]
03 Aug 2010, 16:07
tiruraju wrote: Hi Guys,
Could you please advise what the answer would be in the below case?
A small change done to the actual question ( removed the zeros from the option 1)
What is the value of ?
1. is a mode of [3, 1, -1, 5, 1]
2. is neither positive nor negative
In this case , will the answer be
D ( X would be 1 based in option 1 AND 0 based on the option 2)
or
E ( eventhough X value is determined in both the cases , the values are different)
Kindly post your explanation
Thanks,
Raju i think it would be E- cant find one unique answer due to 2 mode values....(x>0 for example would make it easier!) thanks
|
|
|
|
|
|
Manager
Joined: 04 Feb 2010
Posts: 66
Schools: IESE '13
WE 1: Engineer
Followers: 3
Kudos [?]:
4
[0], given: 0
|
Re: ds - mode (m05q32) [#permalink]
03 Aug 2010, 20:54
tiruraju -
That would never be a question because both statements 1 and 2 MUST be true. In your case, that is not possible.
|
|
|
|
|
|
Manager
Joined: 26 Apr 2010
Posts: 127
Concentration: Strategy, Entrepreneurship
Followers: 2
Kudos [?]:
25
[0], given: 54
|
Re: ds - mode (m05q32) [#permalink]
05 Aug 2010, 06:24
Quote: tiruraju -
That would never be a question because both statements 1 and 2 MUST be true. In your case, that is not possible. Agreed, this is not a 'legal' question. One of the basic principles of DS is that the two statements CANNOT contradict one another. In this case, both statements provide a unique answer (stmt one = 1 and stmt two = 0) which contradict. With that said, if on the GMAT you find yourself where the statements contradict, you have done something wrong. HTHs, Martin.
_________________
I appreciate the kudos if you find this post helpful! +1
|
|
|
|
|
|
Intern
Joined: 12 Mar 2011
Posts: 6
Followers: 0
Kudos [?]:
0
[0], given: 0
|
Re: ds - mode (m05q32) [#permalink]
04 Aug 2011, 09:34
This one was so tricky!! I chose C first, but B is the right answer.
|
|
|
|
|
|
Manager
Joined: 11 Feb 2011
Posts: 91
Followers: 1
Kudos [?]:
0
[0], given: 0
|
Re: ds - mode (m05q32) [#permalink]
04 Aug 2011, 10:59
easy one...0 is the answer & 2nd stmt is sufficient
|
|
|
|
|
|
Manager
Joined: 21 Aug 2010
Posts: 212
Followers: 0
Kudos [?]:
10
[0], given: 28
|
Re: ds - mode (m05q32) [#permalink]
08 Aug 2011, 04:06
It's a nice one.
The answer is B
|
|
|
|
|
|
Intern
Joined: 26 Nov 2010
Posts: 6
Followers: 0
Kudos [?]:
0
[0], given: 0
|
Re: ds - mode (m05q32) [#permalink]
09 Aug 2011, 12:35
stmt 1:
using the formula:
mode = ( 3 * median ) - ( 2 * mean)
u can calculate mode....
hence A is sufficient ...
stmt 2:
using this also v can say mode = 0 as its neither positive nor negative...
so ans has to D...
but y its B ???
ani one plz explain
|
|
|
|
|
|
Director
Status: Final Countdown
Joined: 17 Mar 2010
Posts: 566
Location: India
GPA: 3.82
WE: Account Management (Retail Banking)
Followers: 10
Kudos [?]:
69
[0], given: 75
|
Re: ds - mode (m05q32) [#permalink]
08 Aug 2012, 06:59
(1) Bi-modal -0,1-not sufficient (2)zero-sufficient (B) wins
_________________
" Make more efforts "
Press Kudos if you liked my post
|
|
|
|
|
|
Manager
Joined: 07 Sep 2011
Posts: 65
GMAT 1: 660 Q41 V40
GMAT 2: 720 Q49 V39
WE: Analyst (Mutual Funds and Brokerage)
Followers: 0
Kudos [?]:
12
[0], given: 13
|
Re: ds - mode (m05q32) [#permalink]
08 Aug 2012, 07:06
Easy!
1) INSUFFICIENT- could be either 0 or 1.
2) SUFFICIENT- only number that is neither positive nor negative is 0.
B!
|
|
|
|
|
|
Manager
Joined: 07 Sep 2011
Posts: 65
GMAT 1: 660 Q41 V40
GMAT 2: 720 Q49 V39
WE: Analyst (Mutual Funds and Brokerage)
Followers: 0
Kudos [?]:
12
[0], given: 13
|
Re: ds - mode (m05q32) [#permalink]
08 Aug 2012, 07:08
san1987 wrote: stmt 1:
using the formula:
mode = ( 3 * median ) - ( 2 * mean)
u can calculate mode....
hence A is sufficient ...
stmt 2:
using this also v can say mode = 0 as its neither positive nor negative...
so ans has to D...
but y its B ???
ani one plz explain Not sure where you are getthing this calculation of mode from. But here is the definition of mode: The number which appears most often in a set of numbers. Therefore it could be either 0 or 1. A is INSUFFICIENT.
|
|
|
|
|
|
Manager
Joined: 14 Jun 2012
Posts: 66
Followers: 0
Kudos [?]:
6
[0], given: 1
|
Re: ds - mode (m05q32) [#permalink]
29 Aug 2012, 07:34
Did not really find this one that hard to solve. Looking at A and then B, I did tend to think that C screamed at me but then B does give the value as 0. So B it is.
_________________
My attempt to capture my B-School Journey in a Blog : tranquilnomadgmat.blogspot.com
There are no shortcuts to any place worth going.
|
|
|
|
|
|
GMAT Club team member
Joined: 02 Sep 2009
Posts: 11632
Followers: 1802
Kudos [?]:
9607
[0], given: 829
|
Re: ds - mode (m05q32) [#permalink]
29 Aug 2012, 07:50
x2suresh wrote: What is the value of X ? 1. X is a mode of [3, 0, 1, -1, 0, 5, 1]2. X is neither positive nor negative Source: GMAT Club Tests - hardest GMAT questions REVISED VERSION OF THIS QUESTION IS BELOW: What is the value of x ?(1) x is the mode of {3, 0, 1, -1, 0, 5, 1}. The mode is the number that occurs the most frequently in a data set. For example the mode of {2, 3, 4, 4} is 4. A set can have more than one mode, for example set {2, 2, 3, 3, 5} has 2 modes 2 and 3. If every number in a set occurs an equal number of times, then the set has no mode. For example set {1, 2, 3} has no mode. So, according to above {3, 0, 1, -1, 0, 5, 1} has two modes 0 and 1, which means that x can be either of these two values. Not sufficient. (2) x is the median of {-4, 4, 2, -2} --> the median of a set with even number of terms is the average of two middle terms when arranged in ascending/descending order. So, the median of {-4, -2, 2, 4} is (-2+2)/2=0 --> x=0. Sufficient. Answer: B.
_________________
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
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. NEW!!!
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. NEW!!!
What are GMAT Club Tests?
25 extra-hard Quant Tests
Find out what's new at GMAT Club - latest features and updates
|
|
|
|
|
|
|
Re: ds - mode (m05q32)
[#permalink]
29 Aug 2012, 07:50
|
|
|
|
|
|
|
|
|
|
|
close
