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4024/12 May/Jun 2021, Question 14: Upper and Lower Bounds

Cambridge O Level Mathematics 4024 · Paper 12 (Non-calculator) · Non-calculator · 3 marks

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The question, in short

Use rounded measurements of a path length and a bag mass to find a bound, including the bound for five bags combined.

Summarised in our own words. Use the official paper for the exact wording and any diagrams.

Part (a) · 1 mark

State the upper bound of 62 m given to the nearest metre.

  1. 1Upper bound = 62 + 0.5 = 62.5 m

Answer62.5

Part (b) · 2 marks

Find the lower bound for the total mass of 5 bags, each 80 g to the nearest 10 g.

  1. 1Lower bound of one bag = 80 − 5 = 75 g
  2. 2Lower bound for 5 bags = 5 × 75 = 375 g

Answer375

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Also searched as: 4024/12/M/J/21 · 4024_s21_qp_12 · 4024 s21 12 · question 14.
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