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4024/12 May/Jun 2023, Question 4: Directed Numbers

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

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The question, in short

Work with temperatures: find a midnight value 12 °C below 8 °C, then use the seven daily readings 5, 2, −1, −7, −2, 5, −5 to find the median and the range.

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

Part (a) · 1 mark

Starting from 8 °C at midday, work out the temperature at midnight after a drop of 12 °C.

  1. 18 − 12 = −4 °C

Answer−4

Part (bi) · 1 mark

Find the median of the seven recorded temperatures 5, 2, −1, −7, −2, 5, −5.

  1. 1In order: −7, −5, −2, −1, 2, 5, 5
  2. 2Median = 4th value = −1 °C

Answer−1

Part (bii) · 1 mark

Find the range of the seven recorded temperatures 5, 2, −1, −7, −2, 5, −5.

  1. 1Range = 5 − (−7) = 12 °C

Answer12

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