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IB Biology HL D3.2.15 Box and Whisker Plots Questions

Analyse biological box-and-whisker plots by comparing medians, quartile spreads, extrema, outliers and overlap in IB Biology HL D3.2.15.

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • Read and compare medians, quartiles, ranges and outliers in box-and-whisker plots, including a labelled biological context.
  • Explain a plotted outlier using the 1.5 × interquartile-range rule and use distribution overlap to justify a comparison or deduction.

Learn this topic

Study D3.2.15—Box-and-whisker plots conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

IB Biology HL D3.2.15 Box and Whisker Plots Questions question 1

[Maximum number: 3]

Male and female human skeletons obtained from different archaeological sites in Greece were studied in order to find trends in human height evolution in Europe. The box-and

whisker plots show heights of skeletons dating from two historical periods: Neolithic (6500-3000 BC) and Roman (146-324 AD).

Figure for Question IB Biology HL D3.2.15 Box and Whisker Plots Questions question 1 — IB Biology HL

Question (a)

(a)

Using the graph,

[ 3 ]

Question (i)

(i)

Using the box-and-whisker plot, estimate the median height of females in the Roman period.

[ 1 ]

Question (ii)

(ii)

Using the box-and-whisker plot, estimate the maximum height of males in the Neolithic period.

[ 1 ]

Question (iii)

(iii)

State the reason that some of the data points were plotted outside the whiskers.

[ 1 ]
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