Higher June 2018 Paper 2 Q9
9 The length of each side of a regular pentagon is 8.4 cm to 1 decimal place.
(a) Complete the error interval for the length of one side. [2 marks]\[\ldots\ldots\ldots \text{ cm} \leqslant \text{length} \lt \ldots\ldots\ldots \text{ cm}\]
(b) Complete the error interval for the perimeter. [1 mark]\[\ldots\ldots\ldots \text{ cm} \leqslant \text{perimeter} \lt \ldots\ldots\ldots \text{ cm}\]
| Answer | Mark | Comments |
|---|---|---|
| 8.35 and 8.45 in the correct order | B2 | B1 8.35 on the left or 8.45 on the right or 8.45 and 8.35 in the wrong order accept \(8.44\dot{9}\) for 8.45 |
Additional guidance
Do not accept 8.449… for \(8.44\dot{9}\)
| Answer | Mark | Comments |
|---|---|---|
| 41.75 and 42.25 | B1ft | correct or ft their two different values from (a) their 8.35 must be in the range (8.3, 8.4] their 8.45 must be in the range (8.4, 8.5] correct order or ft order accept \(42.24\dot{9}\) for 42.25 |
Additional guidance
| (8.3, 8.4] does not include 8.3 but does include 8.4 (8.4, 8.5] does not include 8.4 but does include 8.5 | |
| Answer of 8.35 and 8.44 in part (a) leading to 41.75 and 42.2 | B1ft |
| Answer of 8 and 9 in part (a) leading to 40 and 45 | B0ft |