Foundation January 2021 Paper 1 Q15
15 A bag contains 30 coloured counters.
The table gives the number of counters of each colour.
| Colour | Red | Green | Yellow | Blue |
|---|---|---|---|---|
| Number of counters | 7 | 13 | 4 | 6 |
One of the counters is taken at random from the bag.
(a) Write down the probability that this counter is green. (1)
(b) Write down the probability that this counter is not red. (2)
| Scheme | Marks |
|---|---|
| \(\dfrac{13}{30}\) | B1 |
| (1) |
Notes
B1: accept 0.43(333…)
or 43(.333…)%
| Scheme | Marks |
|---|---|
| e.g. \(1 - \dfrac{7}{30}\) or \(\dfrac{13 + 4 + 6}{30}\) or \(\dfrac{23}{a}\) where \(a \gt 23\) and \(a \ne 30\) | M1 |
| \(\dfrac{23}{30}\) | A1 |
| (2) | |
| (3 marks) |
Notes
A1: accept 0.76(666…) or 0.77
or 76(.666…)% or 77%
penalise incorrect notation once only