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4MA1/1FR Jan 2020, Question 19: Upper and Lower Bounds

Pearson Edexcel International GCSE Mathematics A 4MA1 · Paper 1FR (Foundation) · Calculator · 2 marks

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The question, in short

A cat's weight is given as 4.3 kg to 2 significant figures; state the upper and lower bounds of this weight.

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

Part (a) · 1 mark

Write down the upper bound of the cat's weight, given 4.3 kg correct to 2 significant figures.

  1. 1The weight is given to 2 significant figures, so the upper bound is halfway between 4.3 and 4.4.
  2. 24.3 + 0.05 = 4.35

Answer4.35

Part (b) · 1 mark

Write down the lower bound of the cat's weight, given 4.3 kg correct to 2 significant figures.

  1. 1The lower bound is halfway between 4.2 and 4.3.
  2. 24.3 − 0.05 = 4.25

Answer4.25

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