| Date | May 2013 | Marks available | 4 | Reference code | 13M.2.hl.TZ1.1 |
| Level | HL only | Paper | 2 | Time zone | TZ1 |
| Command term | Find | Question number | 1 | Adapted from | N/A |
Question
The marks obtained by a group of students in a class test are shown below.
Given the mean of the marks is 6.5, find the value of k.
Markscheme
\(\frac{{5 \times 6 + 6k + 7 \times 3 + 8 \times 1 + 9 \times 2 + 10 \times 1}}{{13 + k}} = 6.5\) (or equivalent) (M1)(A1)(A1)
Note: Award (M1)(A1) for correct numerator, and (A1) for correct denominator.
\(0.5k = 2.5 \Rightarrow k = 5\) A1
[4 marks]
Examiners report
The question was well done generally as one would expect.
