Higher June 2018 Unit 2 Q13
13. The values \(a\) = 27, \(b\) = 1·9 and \(c\) = 0·81 are each correct to 2 significant figures.
Use the formula \(d = \dfrac{a - b}{c}\) to calculate the least value of \(d\).
You must show all your working. [3]
| Scheme | Marks | Comments |
|---|---|---|
| \(\dfrac{26.5 - 1.95}{0.815}\) or \(\dfrac{24.55}{0.815}\) | M2 | If many attempts are offered without a method/answer being identified then mark final attempt. Award M1 for correct use of values 26.5 ≤ a < 27, 1.9 < b ≤ 1.95 and 0.81 < c ≤ 0.815. OR award M1 for use of 2 of the 3 correct limits. |
| = 30(.12…) | A1 | Mark final answer. Only award A1 if M2 gained. If no marks gained award SC1 for an unsupported answer of 30.12(…). Unsupported 30 or 30.1 gains no marks. |