| Date | May 2013 | Marks available | 2 | Reference code | 13M.1.sl.TZ1.4 |
| Level | SL only | Paper | 1 | Time zone | TZ1 |
| Command term | Find | Question number | 4 | Adapted from | N/A |
Question
The cumulative frequency graph shows the heights, in cm, of 80 young trees.
Write down the median height of the trees.
Write down the 75th percentile.
Find the interquartile range.
Estimate the number of trees that are more than 40 cm in height.
Markscheme
54 (cm) (A1) (C1)
58 (A1) (C1)
58, 45 (A1)
Note: Award (A1) for 45 seen.
58 − 45
= 13 (A1)(ft) (C2)
Note: Follow through from part (b).
80 − 14 (M1)
Note: Award (M1) for 14 seen.
= 66 (A1) (C2)
Examiners report
The reading of values from a cumulative frequency was difficult for candidates and a notable number of candidates left this question unanswered or scored zero.
The reading of values from a cumulative frequency was difficult for candidates and a notable number of candidates left this question unanswered or scored zero.
The reading of values from a cumulative frequency was difficult for candidates and a notable number of candidates left this question unanswered or scored zero.
The reading of values from a cumulative frequency was difficult for candidates and a notable number of candidates left this question unanswered or scored zero.
