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Cambridge IGCSE Statistics practice

How is the polygon closed at the ends?

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Show answerFrequency distributions revisionRevise the key idea

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MCQ

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cambridge_mcq

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Topic

Frequency distributions

Exam-style question

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How is the polygon closed at the ends?.

  1. A.By joining the first and last points
  2. B.By adding points with zero frequency just outside the data range
  3. C.By drawing a horizontal line at the top
  4. D.By shading under the polygon

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Paper 1 structured question: Frequency distributions

Paper 1Statistical Techniques6 marks

Data Table

Test Scores Frequency Distribution

Number of students in each score interval

Score IntervalFrequency
0-93
10-197
20-2912
30-398
40-495
  1. a

    Calculate the midpoints of each score interval.

    Aim for approximately 2 distinct marking points.

    [2]
  2. b

    Plot a frequency polygon using the midpoints and frequencies. Include points with zero frequency before the first and after the last midpoint to close the polygon.

    Aim for approximately 4 distinct marking points.

    [4]