4MA0 Higher January 2015 Paper 4 Q18
18 An athlete runs 400 metres, correct to the nearest metre.
The athlete takes 50.2 seconds, correct to the nearest 0.1 of a second.
Work out the upper bound of the athlete’s average speed.
Give your answer correct to 3 significant figures.
(3)
| Scheme | Marks |
|---|---|
| 400.5 or \(400.4\dot{9}\) or 399.5 or 50.25 or 50.15 or \(50.24\dot{9}\) | B1 |
| \(\dfrac{400.5}{50.15}\) or \(\dfrac{400.4\dot{9}}{50.15}\) | M1 |
| 7.99 | A1 |
| (3 marks) |
Notes
B1: any correct UB or LB
A1: or 7.986...