Question

In which of these situations is a double bar graph useful?
(i) Enrolment of students in class VII in 2009 and 2010
(ii) Marks obtained in term I and term II examinations
(iii) Marks obtained in all subjects of a term examination.

• A. (i) and (ii)
• B. (ii) and (iii)
• C. (iii) and (i)
• D. (i) only

Answer 1

The correct option is A

(i) and (ii)

Let's consider situation (i).
(i) Enrolment of students in class VII in 2009 and 2010.

Here, we have enrolments in the 2 years 2009 and 2010.

So, double bar graph is useful.

Let's consider situation (ii).

(ii) Marks obtained in term I and term II examinations.

Here, marks obtained in 2 exams.

So, double bar graph is useful.

(iii) Marks obtained in all subjects of a term examination.

In the third situation, nothing is being compared; for example - if it had been "marks obtained in all subjects of a term examination in 2015 and 2016", then we could have used double bar graph, but it is not useful for the situation as it is.