O-LevelMathematicsStatistics4024/12 · May/June 2018 · Q165 Marks
The masses of 200 beetles were measured. The results are summarised in the cumulative frequency table and part of the cumulative frequency curve is drawn. Mass (m grams): m ≤ 0.5, m ≤ 1, m ≤ 1.5, m ≤ 2, m ≤ 2.25, m ≤ 2.5, m ≤ 3 Cumulative frequency: 0, 25, 75, 150, 170, 185, 200
- (a)Complete the cumulative frequency curve.[1]
- (b)(i)Use the curve to find an estimate for the median,[1]
- (b)(ii)the lower quartile,[1]
- (b)(iii)the number of beetles that have a mass greater than 1.85 grams.[2]
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
Mark scheme
Marking points from the official mark scheme (May/June 2018). The mark or mark type is shown in brackets.
- [1] Correct completion of the curve
- [1] 1.7
- [1] 1.3
- [1] B1 for 125 seen or SC1 for answer 74 or 76
- [1] 75
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