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Cambridge IGCSE Statistics practice

Paper 1 structured question: Quartiles, percentiles and measures of dispersion

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Quartiles, percentiles and measures of dispersion

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Paper 1Statistical Techniques4 marks

Estimating the interquartile range from a grouped frequency distribution.

Data Table

Grouped Frequency Distribution

A table showing class intervals and frequencies for a dataset.

Class IntervalFrequency
0-105
10-2015
20-3025
30-4020
40-5010
  1. a

    Calculate the interquartile range using the grouped frequency distribution.

    Aim for approximately 4 distinct marking points.

    [4]

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Paper 1 structured question: Quartiles, percentiles and measures of dispersion

Paper 1Statistical Techniques4 marks

Diagram Description

Cumulative Frequency Curve

A cumulative frequency curve is shown with data points plotted for a dataset. The curve rises from 0 to 100 cumulative frequency.

  1. a

    Calculate the interquartile range using the cumulative frequency curve.

    Aim for approximately 4 distinct marking points.

    [4]