BREAKING: Target Test Prep releases Brand New 2026 On Demand GMAT prep course

Redeem
TTP OnDemand GMAT Video Course
Featured Course

Target Test Prep GMAT OnDemand

Scott Woodbury-Stewart’s private virtual classroom — 400 hours of master-class video lessons for the GMAT Focus Edition.

  • 715+ score guarantee — highest in the industry (99th percentile)
  • 52 chapters · 1,500+ lessons · 4,000+ practice questions
  • 400 hours of video · 1,500+ instructor-led HD smartboard lessons
  • 300,000+ students accepted to Harvard, Stanford, Wharton, Booth & Sloan & more
  • 24/7 live support + weekly Zoom office hours with GMAT instructors
  • TTP AI Assist — 24/7 AI-powered virtual tutor for instant help
  • 1,200+ flashcards + AI-powered study assistant & daily calendar
  • OnDemand, LiveTeach & GMAT Bootcamp formats available
  • Also: GRE, SAT Math & Executive Assessment courses
  • MBA Admissions Consulting now available
  • 🏆 2025 EdTech Breakthrough Award: Test Prep Solution Provider of the Year
  • 200,000+ students served
  • 5-day free trial — $0 to start, no auto-billing, cancel anytime
★★★★★ 5.0 (559 reviews)
130-pt guarantee
$0 to start then $127/mo
Start Free 5-Day Trial Read 559 Reviews →

range

Expert replies
Post new topic Post Reply
Previous Topic Next Topic
Master | Next Rank: 500 Posts
Posts: 160
Joined: Fri Aug 22, 2008 4:54 am
Thanked: 5 times
GMAT Score:660
by crazy4gmat » Sat Nov 08, 2008 12:06 am
Professor Vasquez gave a quiz to two classes. Was the range of scores fro the first class equal to the range of scores for the second class?
(1) In each class, the number of students taking the quiz was 26, and the lowest score in each class was 70.
(2) IN each class, the average (arithmetic mean) score on the quiz was 85

(A) Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
(B) Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
(C) BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
(D) EACH statement ALONE is sufficient.
(E) Statements (1) and (2) TOGETHER are NOT sufficient.
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Source: — Data Sufficiency |
Master | Next Rank: 500 Posts
Posts: 106
Joined: Thu May 22, 2008 10:50 am
Thanked: 3 times

by EricLien9122 » Sat Nov 08, 2008 1:55 am
I would choose E.

range= highest score - lowest score

statement 1:

Lack of highest score from class 1 and class 2.

Statement 2:

same problem as statement 1.


Please correct me if I made a mistake.
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Legendary Member
Posts: 940
Joined: Tue Aug 26, 2008 3:22 amFollowed by: 1 member
Thanked: 55 times

IMO E

by iamcste » Sat Nov 08, 2008 4:19 am
1. we know no of students in the class and lowest score

2. we know Avg of each class

from 1 and 2 together,we can just get total score of all the students and nothing else

None of the statement individually or together can give required info about Highest score as the Range may be calculated

Hence E
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Master | Next Rank: 500 Posts
Posts: 344
Joined: Sun Sep 28, 2008 11:00 amFollowed by: 1 member
Location: USA
Thanked: 6 times

by Bidisha800 » Sat Nov 08, 2008 10:35 pm
another (E)
Drill baby drill !

GMATPowerPrep Test1= 740
GMATPowerPrep Test2= 760
Kaplan Diagnostic Test= 700
Kaplan Test1=600
Kalplan Test2=670
Kalplan Test3=570
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Legendary Member
Posts: 621
Joined: Wed Apr 09, 2008 7:13 pmFollowed by: 4 members
Thanked: 33 times

by vittalgmat » Sun Nov 09, 2008 8:13 am
We know 1 and 2 independently are insufficient.
So lets look at them together.

** I am not sure of this logic ** (is the idiom 'sure about' or ' sure of ')

We know that 70 is the lowest in each class and we know mean is 85.
So the highest should be 85 + (85-75) = 100 if the mean should remain at
85. The other 24 numbers should be between these such that none of them is less than 70. Coz if any number is less than 70, there should be a number > 100 to get the mean back to 85. From this I conclude,
answer is C.

I pictured this problem as a see-saw with 13 kids sitting on each side, the fulcrum is at 85 and a 70lb kid on one side.



Either I am wrong or I am smoking something !! ;-)
Thanks
-V
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Legendary Member
Posts: 891
Joined: Sat Aug 16, 2008 4:21 amFollowed by: 1 member
Thanked: 27 times
GMAT Score:660(

by 4meonly » Sun Nov 09, 2008 8:38 am
Agree with C

highest score = 100
range 100-70=30
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Legendary Member
Posts: 891
Joined: Sat Aug 16, 2008 4:21 amFollowed by: 1 member
Thanked: 27 times
GMAT Score:660(

by 4meonly » Tue Nov 11, 2008 6:31 am
What is OA?
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Senior | Next Rank: 100 Posts
Posts: 87
Joined: Tue Jul 15, 2008 10:23 amFollowed by: 1 member
Location: Lima
Thanked: 4 times

by Fab » Tue Nov 11, 2008 7:27 am
I would go with C.

85=(70+X)/2
X=100
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Legendary Member
Posts: 2467
Joined: Thu Aug 28, 2008 6:14 pmFollowed by: 11 members
Thanked: 331 times

by cramya » Tue Nov 11, 2008 7:47 pm
If I am not mistaken the OA is[spoiler] E) [/spoiler]bu we will wait for Carzy4gmat's confirmation since he posted the question.

Hence if u see my posts I always request users to post OA's using SPOILER. This way we dont have to keep waiting wihtout knowing the correct answer. Just a thought... :-)
Last edited by cramya on Tue Nov 11, 2008 7:52 pm, edited 1 time in total.
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Legendary Member
Posts: 2467
Joined: Thu Aug 28, 2008 6:14 pmFollowed by: 11 members
Thanked: 331 times

by cramya » Tue Nov 11, 2008 7:52 pm
I checked and its a GMAT SETS question.

The OA is [spoiler]E)[/spoiler]
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
User avatar
Legendary Member
Posts: 2134
Joined: Mon Oct 20, 2008 11:26 pmFollowed by: 25 members
Thanked: 237 times
GMAT Score:730

by logitech » Tue Nov 11, 2008 7:52 pm
Dude..No MON NO FUN!

Give us the OA, we have the SOLUTION okay!!

Cramya is nice guy but I am not! SO MOVE SLOW and HAND US THE OA!

8)

Don't worry guys, I am in charge!
LGTCH
---------------------
"DON'T LET ANYONE STEAL YOUR DREAM!"
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Legendary Member
Posts: 2467
Joined: Thu Aug 28, 2008 6:14 pmFollowed by: 11 members
Thanked: 331 times

by cramya » Tue Nov 11, 2008 7:59 pm
Feel free to jump in on this thought but even with statements 1 and 2 there is no way to tell if the range is the same or not. It may or may not be


26*85 - 70 makes up the remaining 25 scores. The highest value can be different for 2 classes and still the average could end up being 85. We dont know and cannot point to a single determinable value for the highest score, hence INSUFF

Eg:

Let say 1 is the lowest score for 2 classes with 5 studentsand the average 2

1 1 2 3 5
1 2 2 2 3

Clearly the lowest score is 1 for both class, 2 the mean but range for class 1 is different from range for class 2

(OR)

1 2 2 2 3
1 2 2 2 3

1 LOWEST SCORE, 2 MEAN RANGE SAME.
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
User avatar
Senior | Next Rank: 100 Posts
Posts: 35
Joined: Wed Oct 01, 2008 3:55 pm
Thanked: 6 times

by rmpaes » Wed Nov 12, 2008 12:41 pm
(1) In each class, the number of students taking the quiz was 26, and the lowest score in each class was 70.
(2) IN each class, the average (arithmetic mean) score on the quiz was 85

ya I have to go with E

For example,
The highest value could be 86.
To balance of the 70 score,
we could have 15 86 scores.
The rest could be exactly at the mean.

The highest value could also be 100.
To balance of the 70 score,
we could have 1 100 score.
The rest could be exactly at the mean.

Thus,
we can't know the range from the info given.
700+ your target then check out my 800 gmat blog here:
https://800gmatblog.zoxic.com
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Senior | Next Rank: 100 Posts
Posts: 87
Joined: Tue Jul 15, 2008 10:23 amFollowed by: 1 member
Location: Lima
Thanked: 4 times

by Fab » Thu Nov 13, 2008 2:33 pm
Eg:

Let say 1 is the lowest score for 2 classes with 5 studentsand the average 2

1 1 2 3 5
1 2 2 2 3

Clearly the lowest score is 1 for both class, 2 the mean but range for class 1 is different from range for class 2

(OR)

1 2 2 2 3
1 2 2 2 3

1 LOWEST SCORE, 2 MEAN RANGE SAME.
Are you sure 2 is the mean for the 1st group?
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Legendary Member
Posts: 2467
Joined: Thu Aug 28, 2008 6:14 pmFollowed by: 11 members
Thanked: 331 times

by cramya » Thu Nov 13, 2008 2:37 pm
Fab, sorry that was a typo on my part

I was just picking some numbers to try to prove E)

here u go

Let say 1 is the lowest score for 2 classes with 5 studentsand the average 2

1 1 1 2 5
1 2 2 2 3
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Post new topic Post Reply