Study the following table and answer the questions.
Classification of 100 Students Based on the Marks Obtained by them in Physics and Chemistry in an Examination.
The percentage of number of students getting at least 60% marks in Chemistry over those getting at least 40% marks in aggregate, is approximately?
A.
21%
B.
27%
C.
29%
D.
31%
Correct answer is C
Number of students getting at least 60% marks in Chemistry
= Number of students getting 30 and above marks in Chemistry
= 21
Number of students getting at least 40% marks in aggregate
= Number of students getting 20 and above marks in aggregate
= 73
Required percentage = ( 21/73 x 100 ) %
= 28.77%
≈ 29%.
