Question

Observe the following bar diagram and answer the questions.

figure
(i) What type of bar diagram is it?
(ii) What is the percentage of boys in division D?
(iii) What is the percentage of girls in division A?
(iv) Which division has the same percentage of boys and girls?
(v) What is the average percentage of girls?

Answer 1

(i) Since all the bars have an equal height (100), the diagram is a percentage bar diagram.
(ii) Percentage of boys in division D = $(100-30)=70$
(iii) Percentage of girls in division A = 40
(iv) The division that has the same percentage of boys and girls is division C.

(v) Average percentage of girls = $\frac{\mathrm{Sum}\mathrm{of}\mathrm{the}\mathrm{percentages}\mathrm{of}\mathrm{girls}\mathrm{in}\mathrm{all}\mathrm{divisions}}{\mathrm{Number}\mathrm{of}\mathrm{divisions}}$

$$\begin{gathered} =\left(\frac{40+60+50+30}{4}\right) \\ =\left({\displaystyle \frac{180}{4}}\right) \\ =45 \end{gathered}$$