Edexcel IGCSEMathematicsGeneral Applications6 Marks
The histogram shows information about the heights of 70 plants.
- (a)Find the number of plants with a height greater than 30 cm.[3]
- (b)Work out an estimate for the median height.[3]
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. The mark or mark type is shown in brackets.
- (a) M1 for correct frequency densities for at least 2 bars, e.g. 1.2, 2.8, 1.4, 0.4
- (a) M1 for correct products of FD × width for at least 2 bars, e.g. 10 × 1.2 = 12, 10 × 2.8 = 28, 20 × 1.4 = 28, 25 × 0.4 = 10
- (a) A1 for 10 (plants)
- (b) M1 for identifying the correct position for median, e.g. 70/2 = 35 or 35th value
- (b) M1 for a correct method to find median, e.g. 20 + ((35 – 12)/28) × 10 or 20 + 23/28 × 10
- (b) A1 for 28.2 or 28.21... (accept 28.2 (1 d.p.) but must be more than 2 s.f.)
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