Question

The graph shows the number of students in History, Economics and Statistics in the year 2011 and 2012. What is the difference in the number of students for economics in the year 2011 and in 2012?

A.40
B.42
C.2
D.82

Answer 1

Hint: In the questions, the number of students in different subjects are interpreted graphically. In order to solve the problem, we will have to find the number of students in both the intervals of year by reading the graph and then subtracting the number of students to get the difference.

Complete step-by-step answer:
Given:
In the year 2011-12,
Number of students appearing in History are 35.
Number of students appearing in Economics are 40.
Number of students appearing in Statistics are 25.

In the year 2012-13,
Number of students appearing in History are 23.
Number of students appearing in Economics are 42.
Number of students appearing in Statistics is 30.

In the question it is asked that we will have to find the difference in the number of students for economics in 2011 and in 2012.

Difference in number of students in economics is expressed as,
 $ = {\rm{\text Number}}\;{\rm{of}}\;{\rm{\text students \; in \; year \; 2012}} - {\rm{\text Number \; of \; students \; in \; year \; 2011}} $

 Now we will substitute 40 for year 2011 and 42 for year 2012 in the above expression to find the difference in number of students.
 $ \begin{array}{l}
 = 42 - 40\\
 = 2
\end{array} $
Therefore, the correct answer is 2 that is option (C) is the correct option.
So, the correct answer is “Option C”.

Note: First step to solve such a problem is to read the graph carefully. Make sure to understand what is shown in the graph and the information that is displayed. The next step is to find what the question is asking for. A general mistake that can happen is misinterpretation of the graph or the question.