Higher January 2020 Paper 1R Q16
16 Steffi is going to play one game of tennis and one game of chess.
The probability that she will win the game of tennis is 0.6
The probability that she will win both games is 0.42
Work out the probability that she will not win either game.
(4)
| Scheme | Marks |
|---|---|
| 0.42 ÷ 0.6 (= 0.7) oe | M1 |
| 1 – “0.7” (= 0.3) oe OR 1 – 0.6 (= 0.4) oe | M1 |
| “0.3” × “0.4” oe OR 1 – (0.42 + 0.6 × “0.3” + “0.4” × “0.7”) oe | M1 |
| 0.12 | A1 |
| (4) | |
| (4 marks) |
Notes
M1: (indep)
M1: (indep)
M1: for a complete method
A1: oe