Foundation November 2020 Paper 2 Q13
13 A bag only contains red, blue, yellow and white counters.
A counter is taken at random from the bag.
The table shows the probability it is red and the probability it is blue.
| Colour | red | blue | yellow | white |
|---|---|---|---|---|
| Probability | 0.24 | 0.34 |
There are twice as many yellow counters as white counters in the bag.
Complete the table. [5]
| Answer | Marks | Part marks and guidance | |
|---|---|---|---|
| 0.28 and 0.14 | 5 | B4 for 0.14 identified as white or for 0.28 and 0.14 reversed or M1 for 1 – (0.34 + 0.24) A1 for 0.42 M1 for their 0.42 ÷ (1 + 2) A1 for 0.14 | Allow equivalent fractions or percentages Condone lack of % sign for M marks A1 Implies previous M1 or may be implied by their y + their w = 0.42 |