CAIE IGCSE Mathematics Extended Interpreting Box Plots

Practise comparing distributions from box-and-whisker plots by using medians for typical values, interquartile ranges for variation and quartiles for estimates.

Syllabus
2028–2030
Topic
E9.2
Level
Extended

Exam points

  • compare typical values by reading both medians and translating the numerical difference into context
  • compare consistency using both interquartile ranges, with the smaller IQR indicating less variation
  • use quartile positions to estimate the fraction and count lying above or below a stated boundary

Covered syllabus points

E9.2.1 Read, interpret and draw inferences from tables and statisticalE9.2.2 Compare sets of data using tables, graphs and statistical measures.E9.2.3 Appreciate restrictions on drawing conclusions from given data

E9.2 Interpreting statistical data question 1

[Maximum number: 1]

The box-and-whisker plot shows information about the mass, in kg, of some parcels.

Figure for Question E9.2 Interpreting statistical data question 1 — CAIE IGCSE Mathematics Extended

Find the mass of the heaviest parcel.
kg\mathrm{kg}

E9.2 Interpreting statistical data question 2

[Maximum number: 1]

The box-and-whisker plot shows information about the marks scored by some students in a test.

Figure for Question E9.2 Interpreting statistical data question 2 — CAIE IGCSE Mathematics Extended

This box-and-whisker plot shows information about the marks scored by the same students in a second test.

Figure for Question E9.2 Interpreting statistical data question 2 — CAIE IGCSE Mathematics Extended

Make one comparison between the distributions of marks in the two tests.

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