4MA1/2F Jun 2019, Question 13: Estimating the Mean for Grouped Data
Pearson Edexcel International GCSE Mathematics A 4MA1 · Paper 2F (Foundation) · Calculator · 4 marks
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The question, in short
Using the grouped frequency table for heights of 48 sunflowers, estimate the mean height in cm.
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Solution · 4 marks
- 1Midpoints: 95, 105, 115, 125, 135
- 295 × 8 = 760, 105 × 12 = 1260, 115 × 15 = 1725
- 3125 × 10 = 1250, 135 × 3 = 405
- 4Total = 5400
- 5Mean = 5400 ÷ 48 = 112.5
Answer112.5
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