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

Redeem

Average?

This topic has expert replies
Post new topic Post Reply
Previous Topic Next Topic
Newbie | Next Rank: 10 Posts
Posts: 3
Joined: Sat Jan 31, 2009 10:16 am

Average?

by nakulbatra » Wed Feb 11, 2009 5:37 am
1. Class A and B took a same test. For class A, median score is 80, average score is 82; for class B, median score is 78, average score is 74. Combining A and B, is the average greater than the median?
1). A has 37 students and B has 40 students.
2). A and B have 77 students.
Top
Source: — Data Sufficiency |
Senior | Next Rank: 100 Posts
Posts: 66
Joined: Fri Oct 31, 2008 2:41 pm
Location: London, UK
Thanked: 5 times
GMAT Score:770

Re: Average?

by cjb » Wed Feb 11, 2009 6:22 am
nakulbatra wrote:1. Class A and B took a same test. For class A, median score is 80, average score is 82; for class B, median score is 78, average score is 74. Combining A and B, is the average greater than the median?
1). A has 37 students and B has 40 students.
2). A and B have 77 students.
My guess, in which I have little confidence, is this:

1) This will allow the calculation of the new mean. I have no idea if the new median can be derived form this info, but I would guess not, so insufficient.

2) Won't even allow calculation of mean, so certainly insufficient.

So E, and pray.
80% of success is showing up -- Woody Allen
Top
Master | Next Rank: 500 Posts
Posts: 258
Joined: Thu Aug 07, 2008 5:32 am
Thanked: 16 times

Re: Average?

by x2suresh » Wed Feb 11, 2009 6:41 am
nakulbatra wrote:1. Class A and B took a same test. For class A, median score is 80, average score is 82; for class B, median score is 78, average score is 74. Combining A and B, is the average greater than the median?
1). A has 37 students and B has 40 students.
2). A and B have 77 students.
1)
Average = 82*37+74*40/77 = <78

When you combine two classes.. combined median can't be smaller than smallest median of the two classses.

So median >=78.

Sufficient

2)
We don't know the ratio of Class A:B

Not sufficient

A
Top
Post new topic Post Reply
• Page 1 of 1