Lesson 2.02a

2.02a 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, 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 histogram, what property of a bar represents the class frequency?

    • Perimeter
    • Area
    • Width
    • Height

  2. In a stem-and-leaf diagram, what do the numbers in the stem represent?

    • Cumulative totals
    • Leading digits
    • Trailing digits
    • Class frequencies

  3. Which statistical diagram visually displays the median, quartiles, and extreme values?

    • Box-and-whisker plot
    • Histogram
    • Scatter diagram
    • Cumulative frequency graph

  4. What quantity is plotted on the vertical axis of a cumulative frequency diagram?

    • Cumulative frequency
    • Frequency density
    • Relative frequency
    • Class width

  5. Which type of numerical data is most appropriately displayed using a vertical line chart?

    • Discrete data
    • Continuous data
    • Bivariate data
    • Qualitative data

  6. When histogram class widths are unequal, what is plotted on the vertical axis?

    • Relative frequency only
    • Class width
    • Frequency only
    • Frequency density

  7. Why are there no gaps between bars in a standard histogram?

    • Data is nominal
    • Data is continuous
    • Data is discrete
    • Data is qualitative

  8. A class from 20 to 30 has frequency 18 and width 10. What is its frequency density?

    • 1.8
    • 10
    • 18
    • 0.56

  9. A class from 5 to 15 has frequency 30 and width 10. What is its frequency density?

    • 2
    • 1.5
    • 3
    • 30

  10. A histogram has bars with frequency densities 2, 3 and 1 and widths 5, 5 and 10. What is the total frequency?

    • 6
    • 35
    • 21
    • 18

  11. In a stem-and-leaf diagram where 2 | 5 means 25, what value does 4 | 1 represent?

    • 4.1
    • 401
    • 41
    • 14

  12. What is the median of 3, 5, 7, 8, 12, 15 and 18?

    • 7
    • 12
    • 8
    • 10

  13. A box plot shows Q1 = 12, median = 18, Q3 = 26, minimum 5 and maximum 40. What is the interquartile range?

    • 35
    • 21
    • 28
    • 14

  14. On a cumulative frequency diagram, the cumulative frequencies at x = 20 and x = 30 are 30 and 45. How many values lie between 20 and 30?

    • 75
    • 45
    • 15
    • 30

  15. Which diagram is most suitable for displaying small discrete counts, such as goals scored?

    • Histogram
    • Scatter diagram
    • Vertical line chart
    • Cumulative frequency graph

  16. For classes 0–20 (freq 40), 20–25 (freq 15), 25–45 (freq 30), which has highest frequency density?

    • All equal
    • 0 to 20
    • 20 to 25
    • 25 to 45

  17. What is a main disadvantage of grouping raw data into class intervals?

    • Medians unestimable
    • Widths must vary
    • Data becomes biased
    • Original values lost

  18. A histogram has frequency density 2.5 on 30 to 40 and frequency density 1 on 40 to 50, with both widths 10. About how many values are above 30?

    • 3.5
    • 10
    • 25
    • 35

  19. A stem-and-leaf diagram gives the values 42, 45, 45, 50 and 61. What is the mode?

    • 45
    • 50
    • 61
    • 42

  20. On a cumulative frequency graph of 60 values, which cumulative frequency corresponds to the median?

    • 45
    • 15
    • 60
    • 30

All OCR Maths quizzes