4MA1/2H Jun 2018, Question 20: Histograms (Unequal Class Intervals)
Pearson Edexcel International GCSE Mathematics A 4MA1 · Paper 2H (Higher) · Calculator · 3 marks
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The question, in short
Using a histogram of baby birth weights from 2 to 5 kg with unscaled frequency density, and given 6 babies outside 2.5 to 4 kg, find how many weigh between 2.5 kg and 4 kg.
Summarised in our own words. Use the official paper for the exact wording and the diagram.
Solution · 3 marks
- 1Area for <2.5 kg and >4 kg = 4 × 5 + 1 × 10 = 30 small squares
- 230 squares = 6 babies, so 5 squares = 1 baby
- 3Area from 2.5 to 4 kg = 4 × 5 + 20 × 4 + 25 × 2 + 15 × 4 = 210
- 4210 ÷ 5 = 42
Answer42
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