1MA0 Higher November 2014 Paper 2 Q19
19 Louise makes a spinner.
The spinner can land on green or on red.
The probability that the spinner will land on green is 0.7
Louise spins the spinner twice.
(a) Complete the probability tree diagram.
(b) Work out the probability that the spinner lands on two different colours. (3)
| Answer | Mark | Notes |
|---|---|---|
| 0.3 0.3, 0.7, 0.3 | 2 | B1 for 0.3 as first spin oe B1 for 0.3, 0.7, 0.3 in correct positions for second spin oe |
| Answer | Mark | Notes |
|---|---|---|
| 0.42 | 3 | M1 for ‘0.3’ × ‘0.7’ or 0.7 × ‘0.3’ (=0.21) M1 for ‘0.3’ × ‘0.7’ + 0.7 × ‘0.3’ (OR M2 for \(1 - 0.7^2 - 0.3^2\)) A1 for 0.42 oe |