4MA1/1HR Jun 2018, Question 2: Estimating the Mean for Grouped Data
Pearson Edexcel International GCSE Mathematics A 4MA1 · Paper 1HR (Higher) · Calculator · 4 marks
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The question, in short
Using the grouped frequency table of times T hours students spent doing sport, estimate the mean time and give it in hours to 1 decimal place.
Summarised in our own words. Use the official paper for the exact wording and any diagrams.
Solution · 4 marks
- 1Use midpoints 1, 3, 5, 7, 9
- 2Σfx = 5 + 27 + 120 + 280 + 63 = 495
- 3Σf = 5 + 9 + 24 + 40 + 7 = 85
- 4Mean = 495 ÷ 85 = 5.82…
- 5= 5.8 hours (1 d.p.)
Answer5.8
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