4MA1/1H Jun 2019, Question 11: Upper and Lower Bounds
Pearson Edexcel International GCSE Mathematics A 4MA1 · Paper 1H (Higher) · Calculator · 3 marks
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The question, in short
Given a = 6 to the nearest integer and b = 15 to the nearest 5, find the upper bound of C = b − a, showing working.
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Solution · 3 marks
- 1b is correct to the nearest 5, so upper bound of b = 17.5
- 2a is correct to the nearest integer, so lower bound of a = 5.5
- 3C = b − a, so upper bound of C = 17.5 − 5.5
- 417.5 − 5.5 = 12
Answer12
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