Originality of a story-completion exercise by Year 4 students

Explain that in all graphical displays (bar charts, stacked bar charts and pie charts), the area of ink used for each category is in proportion to its frequency (or relative frequency);

The data come from a table published by the New Zealand National Education Monitoring Unit describing the originality of a story-completion exercise by 1440 Year 4 students in 2000. (Each child was asked to supply an ending to a story.)