Chapter 10 Practice Paper: Statistical Data Handling — mark scheme
Secondary 1 · Lower Secondary Mathematics (G2 / G3)
Mark scheme
Statistical Data Handling
Chapter 10 Practice Paper · Maximum mark: 30
Notes for markers
- Award one mark for each point marked [1], up to the marks shown for the part.
- Accept answers worded differently that show the same understanding.
- Units are required where the answer line shows one. ecf: allow an error carried forward.
Section A: Multiple-choice questions[10 marks]
| Question | Answer | |
|---|---|---|
| 1 | CThe cycle starts by settling the question; only then is data gathered to answer it. | 1 |
| 2 | AAdd the two categories: 12 + 8 = 20 pupils. | 1 |
| 3 | B4 × 3 = 12, and the half symbol adds ½ × 3 = 1.5, giving 13.5 hours. | 1 |
| 4 | D126/360 = 7/20 of the club, and 7/20 × 40 = 14 members. | 1 |
| 5 | CA changing quantity measured over time is drawn as a line graph. | 1 |
| 6 | AOne class ends exactly where the next begins, so the bars touch. | 1 |
| 7 | DAdd the classes below 3 kg: 14 + 22 = 36 parcels. | 1 |
| 8 | B90° is a quarter of 360°, so 15 pupils are a quarter of the group: 15 × 4 = 60. | 1 |
| 9 | BA scale that skips zero makes bar heights exaggerate differences, so read the scale before believing the picture. | 1 |
| 10 | CThe difference is 4 − 1 = 3 symbols, and 3 × 5 = 15 books. | 1 |
Section B: Structured questions[20 marks]
| Question | Answer and marking points | Marks |
|---|---|---|
| 1(a) | Sport, chosen by 18 pupils.
| 1 |
| 1(b) | 12/40 = 3/10 [1] | 1 |
| 1(c) | Angle = 18/40 × 360° = 162°.
| 2 |
| 1(d) | The activities are separate categories with no order or time scale, so joining them with a line would invent a trend.
| 1 |
| Total for Question 1 | 5 | |
| 2(a) | 150/360 = 5/12 [1] | 1 |
| 2(b) | Members = 5/12 × 60 = 25.
| 2 |
| 2(c) | Angle = 9/60 × 360° = 54°.
| 2 |
| Total for Question 2 | 5 | |
| 3(a) | 82 − 58 = 24 °C [1] | 1 |
| 3(b) | Between 0 and 5 minutes (a fall of 14 °C, the steepest drop).
| 1 |
| 3(c) | Rate = 14 °C ÷ 5 min = 2.8 °C per minute.
| 2 |
| 3(d) | About 56 °C (accept 55–57 °C): 12 minutes lies between the readings of 58 °C at 10 minutes and 51 °C at 15 minutes.
| 1 |
| Total for Question 3 | 5 | |
| 4(a) | 12 + 8 = 20 cats [1] | 1 |
| 4(b) | The 3 kg up to 4 kg class, with 14 cats.
| 1 |
| 4(c) | The data is grouped, so the heaviest cat is only known to lie somewhere between 5 kg and 6 kg.
| 1 |
| 4(d) | Angle = 14/40 × 360° = 126°.
| 2 |
| Total for Question 4 | 5 |
— End of mark scheme —