CAIE IGCSE Mathematics Extended E9.6.1 Draw & interpret cumulative frequency tables & diagrams.

Practise building cumulative frequency tables and diagrams, then reading estimates from an accurately plotted increasing graph.

Exam points

complete cumulative frequency tables by adding frequencies at each listed boundary
plot cumulative totals at the upper class boundaries with accurate grid positions
use the cumulative frequency graph to estimate values above or below a boundary

[Maximum number: 2]

200 students estimate the volume, $V \mathrm{~m}^{3}$ , of a classroom. The cumulative frequency diagram shows their results.

Use the graph to find an estimate of

the number of students who estimate that the volume is greater than $300 \mathrm{~m}^{3}$ .

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