Topic summary · Student revision
Graphical Representation of Data Topic Review summary
Self-review on charts for S1: histograms, stem-and-leaf, box plots, and cumulative frequency.
Files: Topic-Review-Graphical-Representation-of-Data.pdf · Topic-Review-Graphical-Representation-of-Data-Answers.pdf · free public downloads · diagrams in the PDFs
Key learning points
- Histograms use frequency density when class widths vary.
- Cumulative frequency curves estimate medians and percentiles.
- Box plots show five-number summaries and skewness cues.
- Choose chart type to match the data (categorical vs continuous).
- Label axes and units — easy marks in exams.
Worked example 1 — Density
Frequency density formula.
Working
Histogram bar area ∝ frequency.
Worked example 2 — Median
Estimate median from cumulative frequency graph.
Working
Interpolate if needed.
Worked example 3 — Histograms use frequency density when clas
Apply this idea from the Topic Review: Histograms use frequency density when class widths vary.
Working
Attempt without notes, then check the answers PDF.
Worked example 4 — Cumulative frequency curves estimate media
Apply this idea from the Topic Review: Cumulative frequency curves estimate medians and percentiles.
Working
Attempt without notes, then check the answers PDF.
Scaffolded Learning Sheet and answers (PDFs)
This page is a short, searchable overview for revision and search engines. Use the Scaffolded Learning Sheet first, then the Answers PDF for a full written solution. The printable PDFs remain the main classroom resource.