Lesson 2.02a

2.02a Tables and diagrams for single-variable data Quiz: OCR Maths, Unit 12

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 2.02a, Tables and diagrams for single-variable data: 20 multiple choice questions for the OCR Maths (H240), Unit 12: Data Presentation and Interpretation, written with Revision Ninja.

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The 20 questions

  1. In a standard histogram, what does the area of each bar directly represent?

    • Frequency
    • Class width
    • Cumulative frequency
    • Frequency density

  2. How is the frequency density of a class interval in a histogram calculated?

    • Frequency ÷ 2
    • Width ÷ frequency
    • Frequency × width
    • Frequency ÷ width

  3. Which statistical diagram explicitly displays every individual raw data value in a dataset?

    • Cumulative frequency graph
    • Histogram
    • Boxplot
    • Stem-and-leaf diagram

  4. In a box-and-whisker plot, what statistical measure is represented by the length of the box?

    • Full range
    • Variance
    • Standard deviation
    • Interquartile range

  5. Which diagram is most suitable for estimating the median of a large continuous dataset?

    • Bar chart
    • Pie chart
    • Cumulative frequency graph
    • Dot plot

  6. A class interval is 10 to 20 with a frequency of 30. What is its frequency density?

    • 3
    • 2
    • 300
    • 0.33

  7. What summary statistic is represented by the vertical line inside the box of a boxplot?

    • Mode
    • Median
    • Mean
    • Range

  8. A histogram bar has width 5 and frequency density 4. What is the class frequency?

    • 1.25
    • 9
    • 20
    • 0.8

  9. Which element must always be included with a stem-and-leaf diagram for correct data interpretation?

    • Trend line
    • Y-axis label
    • Cumulative total
    • Key

  10. For a cumulative frequency graph representing 80 data values, at what cumulative frequency is the median?

    • 80
    • 60
    • 40
    • 20

  11. Which diagram uses dots plotted directly above a number line to display small discrete datasets?

    • Histogram
    • Dot plot
    • Vertical line chart
    • Scatter diagram

  12. On a cumulative frequency graph with 100 values, which cumulative frequency gives the upper quartile?

    • 75
    • 50
    • 25
    • 100

  13. When linking a continuous histogram to a probability distribution, what must the total area equal?

    • 100
    • 10
    • 0.5
    • 1

  14. In a boxplot, how is the interquartile range represented geometrically?

    • Distance between whiskers
    • Total whisker length
    • Line inside box
    • Box length

  15. Classes 0–5 and 5–15 have equal frequencies. How do their histogram bar heights compare?

    • First is double
    • First is half
    • Heights are equal
    • Second is double

  16. Which statistical diagram is most appropriate for displaying discrete data in non-overlapping separate categories?

    • Histogram
    • Bar chart
    • Boxplot
    • Cumulative frequency curve

  17. A cumulative frequency curve ends at 120. At what cumulative frequency value is the lower quartile?

    • 90
    • 60
    • 30
    • 15

  18. If a histogram bar height doubles and its class width quadruples, by what factor does frequency increase?

    • 8
    • 2
    • 6
    • 4

  19. Why are gaps deliberately left between bars in a standard bar chart?

    • Data is continuous
    • Data is discrete
    • Frequencies are equal
    • Class widths vary

  20. For a cumulative frequency graph of 200 items, between which cumulative frequencies is the middle 50%?

    • 0 and 100
    • 25 and 75
    • 100 and 200
    • 50 and 150

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