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Cambridge IGCSE Statistics practice

What is the primary purpose of the interquartile range?

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MCQ

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cambridge_mcq

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Topic

Quartiles, percentiles and measures of dispersion

Exam-style question

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What is the primary purpose of the interquartile range?.

  1. A.To measure the spread of the entire dataset
  2. B.To measure the spread of the middle 50% of the data
  3. C.To find the average of the dataset
  4. D.To determine the mode of the dataset

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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]