6 2
Look at the graph.
It shows growth in boys between the ages of 2 and 20 years.
The lines show percentiles.
For example the top line shows the 95th percentile. This means 95% of boys are at or below that height. Boys, 2 to 20 years
height in cm
200 195 190 185 180 175 170 165 160 155 150 145 140 135 130 125 120 115 110 105 100 95 90 85 80 75
95th 90th 75th 50th 25th 10th 5th
2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 age in years
(a) (i) What is the range in height between the 5th and 95th percentile for boys aged 13? ...................................................................................................................................... [1]
(ii) Suggest why the range for boys at age 13 is greater than the range for boys aged 2. ........................................................................................................................................... ...................................................................................................................................... [1]
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