O-LevelMathematicsStatistics4024/22 · Oct/Nov 2025 · Q246 Marks
Owen records the mass of each of 250 onions. The histogram shows the results. [Figure 24]
- (a)Show that there are 28 onions with a mass of 200 g or less.[1]
- (b)Calculate an estimate of the mean mass. You must show all your working.[5]
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Mark scheme
Marking points from the official mark scheme (Oct/Nov 2025). The mark or mark type is shown in brackets.
- [1] 0.7 × (200 – 160) = 28
- [1] M1 for correct frequencies 3.9 × 20 and 4.5 × 20 and 0.9 × 60 soi
- [1] M1 for 180, 210, 230, 270 soi
- [1] M1 for Σtheir f × x where x is in correct interval including boundaries
- [1] M1 dep for Σfx / 250 dep on third M1
- [1] 226.8 nfww
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