4MA0 Foundation January 2014 Paper 2R Q12
12 Tanya goes to school by bus.
The probability that her bus arrives on time is 0.8
(a) Work out the probability that her bus does not arrive on time. (1)
Tanya goes to school by bus on 200 days in a year.
Each day, the probability that her bus arrives on time is 0.8
(b) Work out an estimate for the number of these 200 days that her bus arrives on time. (2)
| Scheme | Marks |
|---|---|
| 0.2 | B1 |
| (1) |
| Scheme | Marks |
|---|---|
| 200 × 0.8 | M1 |
| 160 | A1 |
| (2) | |
| (Total 3 marks) |