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)

A double bar graph is a graphical display of information using bars at various heights. We can use a double bar graph to compare two data groups. Therefore, a double bar graph is useful while comparing enrolment of students in class VII in 2009 and 2010 and for marks obtained in term I and term II examinations. But double bar graphs will not be useful for comparing marks obtained in all subjects of a term examination since there is more than one subject.
Therefore, (i) and (ii) are the correct options.