(i)[4]
On graph paper, use the same pair of axes to draw two cumulative frequency graphs showing the data.
(ii)[3]
During a school trip, the students must go into a cave that is $165\text{ cm}$ high. Use your graph to estimate the percentage of girls who will be unable to stand upright.
(iii)[1]
The students need to compare the heights of the girls and the boys. State one advantage of using a pair of box-and-whisker plots rather than the cumulative frequency graphs for this comparison.