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Cambridge IGCSE Statistics practice

Paper 1 structured question: Frequency distributions

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Frequency distributions

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Paper 1Statistical Techniques2 marks

A grouped frequency distribution for discrete data has the classes: 1–3, 4–6, 7–9.

Data Table

Grouped Frequency Distribution Classes

Classes for discrete data

ClassLower Class LimitUpper Class Limit
1–313
4–646
7–979
  1. a

    Calculate the midpoint of the class 4–6.

    Aim for approximately 1 distinct marking point.

    [1]
  2. b

    Determine the class width of the class 7–9.

    Aim for approximately 1 distinct marking point.

    [1]

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Paper 1 structured question: Frequency distributions

Paper 1Statistical Techniques2 marks

Data Table

Grouped Frequency Distribution Classes

Classes for continuous data

ClassLower Class LimitUpper Class Limit
10–191019
20–292029
30–393039
  1. a

    Identify the class boundaries for the class 10–19.

    Aim for approximately 2 distinct marking points.

    [2]