Foundation November 2020 Paper 1 Q19
19 One morning Kai records the colour of the cars passing his house.
He then works out the relative frequency of each colour.
Some of his results are shown in this table.
| Colour | Silver | Red | Green | Black | Other |
|---|---|---|---|---|---|
| Relative frequency | 0.16 | 0.10 | 0.24 | 0.32 |
The following morning, Kai is going to record the colour of the first 200 cars to pass his house.
Work out an estimate for the total number of cars, coloured silver or red, that he should expect to see. [4]
| Answer | Marks | Part marks and guidance | |
|---|---|---|---|
| 68 | 4 | B3 for 36 and 32 nfww OR B1 for [silver =] 0.18 or 18% and M2 for their 0.18 × 200 + 0.16 × 200 oe implied by their 0.34 × 200 or M1 for their 0.18 × 200 implied by 36 or 0.16 × 200 implied by 32 or their 0.18 + 0.16 implied by 0.34 | May be in table |