| Date | May 2017 | Marks available | 2 | Reference code | 17M.2.sl.TZ1.1 |
| Level | SL only | Paper | 2 | Time zone | TZ1 |
| Command term | Find | Question number | 1 | Adapted from | N/A |
Question
Consider the following frequency table.
Write down the mode.
[1]
a.i.
Find the value of the range.
[2]
a.ii.
Find the mean.
[2]
b.i.
Find the variance.
[2]
b.ii.
Markscheme
mode=10 A1 N1
[1 mark]
a.i.
valid approach (M1)
egxmax, interval 2 to 11
{\text{range}} = 9 A1 N2
[2 marks]
a.ii.
7.14666
{\text{mean}} = 7.15 A2 N2
[2 marks]
b.i.
recognizing that variance is {({\text{sd}})^2} (M1)
eg\,\,\,\,\,\operatorname{var} = {\sigma ^2},{\text{ 2.9060}}{{\text{5}}^2},{\text{ }}{2.92562^2}
{\sigma ^2} = 8.44515
{\sigma ^2} = 8.45 A1 N2
[2 marks]
b.ii.
Examiners report
[N/A]
a.i.
[N/A]
a.ii.
[N/A]
b.i.
[N/A]
b.ii.
