4400 Higher November 2008 Paper 4 Q5
5 When Peter goes to work, he can be early or on time or late.
The probability that he will be early is 0.2
The probability that he will be late is 0.1
(a) Work out the probability that he will be on time. (2)
(b) Peter will go to work 20 times next month.
Work out an estimate for the number of times he will be early next month. (2)
Work out an estimate for the number of times he will be early next month. (2)
| Scheme | Marks |
|---|---|
| 1 − (0.2 + 0.1) | M1 |
| 0.7 | A1 |
| (2) |
Notes
A1: oe
| Scheme | Marks |
|---|---|
| \(0.2 \times 20\) | M1 |
| 4 | A1 |
| (2) | |
| (4 marks) |
Notes
A1: or \(\frac{4}{20}\) oe or 4 out of 20