CAIE IGCSE Mathematics Extended E9.7.2 Calculate with Frequency Density Questions

Practise Extended CAIE IGCSE Mathematics by using frequency density, class width and bar area to construct and interpret unequal-width histograms.

Exam points

Calculate frequency density as frequency divided by class width for grouped continuous data.
Use frequency density, class width and bar area to calculate missing frequencies or histogram heights.
Interpret and construct histograms with unequal class intervals, correct widths, scales and units.

[Maximum number: 2]

Some students record their reaction times.
The table shows the results.

On a histogram, the height of the block for the $0<t\leqslant6$ interval is 7.5 cm.
Calculate the height of the block for the $6<t\leqslant10$ interval.

Table for Question CAIE IGCSE Mathematics Extended E9.7.2 Calculate with Frequency Density Questions question 1 — CAIE IGCSE Mathematics Extended

10
M1 for $\frac{7.5}{18/6}$ oe or better, or frequency densities 3 and 4, or 45 and 4h, or 45 and 40

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CAIE IGCSE Mathematics Extended E9.7.2 Calculate with Frequency Density Questions question 1