Foundation June 2019 Paper 2 Q8
8 Darren has these 20 crayons in a box:
- 8 blue
- 4 red
- 5 black
- 3 green.
(a) He chooses a crayon at random from the box.
Which arrow shows the probability that this crayon is
(i) blue, [1]
(ii) yellow, [1]
(iii) not black. [1]
(b) Darren buys 16 more crayons that are either blue or red.
He puts these in the box with the 20 crayons he already has.
He puts these in the box with the 20 crayons he already has.
He now picks a crayon at random from the box.
The probability that he picks a blue crayon is evens.
How many red crayons did he buy? [3]
| Answer | Marks | Part marks and guidance | |
|---|---|---|---|
| (i) C | 1 | Mark answer line | |
| (ii) A | 1 | ||
| (iii) E | 1 | If all 3 answer lines are blank SC1 for all 3 colours correctly placed on the diagram | |
| Answer | Marks | Part marks and guidance | |
|---|---|---|---|
| 6 nfww | 3 | M2 for \(\dfrac{20 + 16}{2} - 8\) or M1 for \(\dfrac{20 + 16}{2}\) | M2 may be implied by 10 [either 10 more blue or 10 total red] but nfww M1 may be implied by 18 [total blue] |