| Date | November 2010 | Marks available | 3 | Reference code | 10N.2.sl.TZ0.1 |
| Level | SL only | Paper | 2 | Time zone | TZ0 |
| Command term | Find | Question number | 1 | Adapted from | N/A |
Question
A standard die is rolled 36 times. The results are shown in the following table.
Write down the standard deviation.
Write down the median score.
Find the interquartile range.
Markscheme
\(\sigma = 1.61\) A2 N2
[2 marks]
median \( = 4.5\) A1 N1
[1 mark]
\({Q_1} = 3\) , \({Q_3} = 5\) (may be seen in a box plot) (A1)(A1)
\({\text{IQR}} = 2\) (accept any notation that suggests the interval 3 to 5) A1 N3
[3 marks]
Examiners report
Surprisingly, this question was not answered well primarily due to incorrect GDC use and a lack of understanding of the terms "median" and "interquartile range". Many candidates opted for an analytical approach in part (a) which always resulted in mistakes.
Some candidates wrote the down the mean instead of the median in part (b).
Surprisingly, this question was not answered well primarily due to incorrect GDC use and a lack of understanding of the terms "median" and "interquartile range".
