Foundation November 2021 Paper 1 Q14
14 Counters in a bag are red, white or blue.
A counter is picked at random.
Complete the table. [2 marks]
| Red | White | Blue | |
|---|---|---|---|
| Probability | 0.15 | 0.4 |
| Answer | Mark | Comments |
|---|---|---|
| \(1 - (0.15 + 0.4)\) or \(1 - 0.55\) | M1 | oe |
| 0.45 | A1 | oe fraction or percentage SC1 0.81 or 81% or \(\dfrac{81}{100}\) |
Additional guidance
| Ignore incorrect simplification or conversion of a correct probability | |
| eg 0.45 converted to \(\dfrac{4}{5}\) | M1A1 |
| \(1 - (0.4 - 0.15)\) | M0A0 |
| 0.45 seen as final answer but nothing in table | M1A1 |
| Subtraction from 1 may be implied | |
| eg \(0.15 + 0.4 = 0.45\), answer 0.55 | M1A0 |
| Embedded answer eg \(0.15 + 0.4 = 0.55\) then \(0.55 + 0.45 = 1\) | M1A0 |
| 0.45 seen but contradictory value in table – table takes precedence | |
| Working in percentages without the percentage sign is condoned for M1 |