Bar Graphs
Bar Graphs
TGM Original Questions
The bar graph below shows the average height of boys and girls of a country aged from \(9\) to \(18\).
- Using the data from the bar graph above, complete the table below, which shows the difference between the average height of boys and girls aged from \(9\) to \(18\).
| Age | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 |
|---|---|---|---|---|---|---|---|---|---|---|
| Difference (cm) | 1 | -1 | 10 | 11 | 11 | 12 |
- State one advantage and one disadvantage, respectively, of the drawing of the graph above, where the vertical axis does not start from zero.
- Hence complete the line graph below.
- State a trend you find from the average height of boys and girls of the country aged from \(9\) to \(18\).
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Answer:(i) Ages \(11,12,13,14\): \(-2,-1,3,7\text{ cm}\) (ii) Advantage: small differences are easier to see. Disadvantage: the differences may appear exaggerated (iii) Plot \((9,1),(10,-1),(11,-2),(12,-1),(13,3),(14,7),(15,10),(16,11),(17,11),(18,12)\) (iv) Girls are taller at ages \(10\)–\(12\); boys are taller at age \(9\) and ages \(13\)–\(18\), with an overall widening difference from age \(13\)
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