Date | May 2008 | Marks available | 1 | Reference code | 08M.1.sl.TZ1.9 |
Level | SL only | Paper | 1 | Time zone | TZ1 |
Command term | Write down | Question number | 9 | Adapted from | N/A |
Question
The table below shows the number of words in the extended essays of an IB class.
Draw a histogram on the grid below for the data in this table.
Write down the modal group.
The maximum word count is \(4000\) words.
Write down the probability that a student chosen at random is on or over the word count.
Markscheme
(A3) (C3)
Notes: (A3) for correct histogram, (A2) for one error, (A1) for two errors, (A0) for more than two errors.
Award maximum (A2) if lines do not appear to be drawn with a ruler.
Award maximum (A2) if a frequency polygon is drawn.
[3 marks]
\({\text{Modal group}} = 3800 \leqslant w < 4000\) (A1) (C1)
[1 mark]
\({\text{Probability}} = \frac{3}{{35}}{\text{ }}(0.0857{\text{, }}8.57\% )\) (A1)(A1) (C2)
Note: (A1) for correct numerator (A1) for correct denominator.
[2 marks]
Examiners report
A surprising number of the candidates did not appear to have brought a ruler/straight edge and so lost a mark in this question as they were asked to draw a histogram which means the lines must be drawn using a ruler/straight edge. Some candidates drew a frequency polygon. Parts (b) and (c) were generally answered well though \(20/35\) was seen occasionally in part (c).
A surprising number of the candidates did not appear to have brought a ruler/straight edge and so lost a mark in this question as they were asked to draw a histogram which means the lines must be drawn using a ruler/straight edge. Some candidates drew a frequency polygon. Parts (b) and (c) were generally answered well though \(20/35\) was seen occasionally in part (c).
A surprising number of the candidates did not appear to have brought a ruler/straight edge and so lost a mark in this question as they were asked to draw a histogram which means the lines must be drawn using a ruler/straight edge. Some candidates drew a frequency polygon. Parts (b) and (c) were generally answered well though \(20/35\) was seen occasionally in part (c).