Intermediate June 2017 Unit 1 Q10
10. Ceri has a set of cards.
Each of her cards is labelled North, East, South or West.
(a) Ceri chooses one card at random from her set of cards.
Complete the table below to find the probability of Ceri choosing a card labelled West. [2]
Complete the table below to find the probability of Ceri choosing a card labelled West. [2]
| Label | North | East | South | West |
| Probability | 0·4 | 0·25 | 0·2 |
(b) Ceri chooses one card at random from her set of cards.
What is the probability that the card is labelled East or South? [2]
(c) Sasha has an identical set of cards.
Ceri and Sasha each choose one card at random from their set of cards.
Ceri and Sasha each choose one card at random from their set of cards.
What is the probability that they both choose a card labelled North? [2]
| Scheme | Marks | Comments |
|---|---|---|
| 1 – (0·4 + 0·25 + 0·2) | M1 | |
| = 0·15 or equivalent. | A1 |
| Scheme | Marks | Comments |
|---|---|---|
| 0·25 + 0·2 | M1 | |
| = 0·45 or equivalent. | A1 |
| Scheme | Marks | Comments |
|---|---|---|
| 0·4 × 0·4 | M1 | |
| = 0·16 or equivalent. | A1 |