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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 Techniques2 marks

A cumulative frequency curve is provided for the test scores of 100 students.

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Cumulative Frequency Curve

The cumulative frequency curve shows the distribution of test scores for 100 students.

  1. a

    Calculate Estimate the median score from the cumulative frequency curve.

    Aim for approximately 2 distinct marking points.

    [2]

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

Paper 1Statistical Techniques3 marks

Data Table

Grouped Frequency Distribution

The table shows the frequency of ages in intervals for survey participants.

Age IntervalFrequency
10-2015
20-3025
30-4030
40-5020
50-6010
  1. a

    Calculate Estimate the 75th percentile age using linear interpolation.

    Aim for approximately 3 distinct marking points.

    [3]