Edexcel IAL Mathematics S1.2.1 histograms, stem-and-leaf and box plots

Practise statistical diagrams by building histograms, reading stem-and-leaf or box plots, and comparing distributions from visual evidence.

Exam points

Use class width and frequency density to calculate histogram bar heights, areas or frequencies.
Read quartiles, medians or 75% thresholds from box plots and stem-and-leaf displays.
Compare distributions using centre, spread, skewness or outliers shown on the diagram.

[Maximum number: 3]

The histogram shows the times taken, in seconds, by each of 260 people to complete a puzzle.

Use the histogram to complete the frequency table for the times taken to complete the puzzle.

Given that $\sum \mathrm{f} t=11087.5$ and $\sum \mathrm{f} t^{2}=505718.75$

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