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

Redeem

percentile

Expert replies
Source: — Problem Solving |

by BuckeyeT » Thu Feb 26, 2009 10:50 am
Class 1
90th percentile of 80 = 9/10 * 80 = 72 (71 below, 8 above)

Class 2
xth percentile of 100 = x% * 100 = 100 - 19
x * 100 = 81
x = 81/100
= .81 or 81%

Together
Her combined grade rank / Possible ranks
(72 + 81) / (80 + 100)
153 / 180
85% or 85th percentile.

D.
Join the discussion

by sanju09 » Wed Apr 08, 2009 6:07 am
Amy was the 90th percentile of the 80 grades for her class, therefore, 10% are higher than Amy's, 10%*80 = 8.

19 of the other class was higher than Amy. Totally, 8 + 19 = 27

Then, the percentile is:

(180 - 27)/180 = 85/100
The mind is everything. What you think you become. -Lord Buddha



Sanjeev K Saxena
Quantitative Instructor
The Princeton Review - Manya Abroad
Lucknow-226001

www.manyagroup.com
Join the discussion