Intermediate November 2022 Unit 2 Q16
16. Two times are recorded correct to the nearest 0·1 second.
| 12·4 seconds |
| 25·5 seconds |
Calculate the greatest possible difference between these times. [3]
| Scheme | Marks | Comments |
|---|---|---|
| 25·55 (seconds) – 12·35 (seconds) OR 25·5 (seconds) – 12·4 (seconds) + 2 × 0·05 (sec) | M2 | Award M2 for USE of the correct bounds. If many attempts are offered without a method/answer being identified, then mark the final attempt. If M2 not gained, award M1 A0 for correct USE of values 12·3 ≤ t < 12.4 and 25.5 < t ≤ 25·6. [Note: \(25{\cdot}54\dot{9}\) is equivalent to 25·55 and with an answer of 13.2 (seconds) gains all 3 marks] |
| = 13·2 (seconds) | A1 | CAO. Mark final answer. Unsupported 13·2 is awarded M2 A1. |