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

Redeem

Question - Statistics

This topic has expert replies
Post new topic Post Reply
Previous Topic Next Topic
Source: — Problem Solving |
User avatar
Community Manager
Posts: 1537
Joined: Mon Aug 10, 2009 6:10 pm
Thanked: 653 times
Followed by:252 members

by papgust » Wed Jun 02, 2010 11:03 pm
Non-negative single digit integer varies from 0 to 9 (10 nos)

Condition is Median must increase and range should remain the same.

Existing Set is (2,3,7,8). When you add nos 0 to 9 to the set, only 3 nos satisfy the conditions --> 6,7,8.

So, probability is 3/10 or 30%.
Top
User avatar
GMAT Instructor
Posts: 509
Joined: Wed Apr 21, 2010 1:08 pm
Location: Irvine, CA
Thanked: 199 times
Followed by:85 members
GMAT Score:750

by tpr-becky » Wed Jun 02, 2010 11:56 pm
For the range to stay the same the number chosen must be 2, 3, 4, 5, 6, 7, 8 - for the median to increase you need numbers larger than the current median - the current median is 5 -- (3+7)/2 Thus only the numbers 6, 7 or 8 will suffice.

For probability you need want over total - there are three numbers that will satisfy what you want and 10 total numbers therefore the answer is B - 30%
Becky
Master GMAT Instructor
The Princeton Review
Irvine, CA
Top
Post new topic Post Reply
• Page 1 of 1