Lesson 2.02b

2.02b Histograms and area Quiz: OCR Maths, Unit 12

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 2.02b, Histograms and area: 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. What property of a bar in a histogram directly represents the class frequency?

    • Bar width
    • Bar height
    • Frequency density
    • Bar area

  2. How is frequency density calculated for a given class in a histogram?

    • Width divided by frequency
    • Frequency times width
    • Frequency plus width
    • Frequency divided by width

  3. On a scatter diagram, what term describes data consisting of pairs of measurements?

    • Categorical data
    • Bivariate data
    • Univariate data
    • Discrete data

  4. What does a strong statistical correlation between two variables fail to prove?

    • Linear relationship
    • Association
    • Causation
    • Mutual dependence

  5. What is the standard deviation of a dataset whose variance is equal to 25?

    • 50
    • 5
    • 12.5
    • 625

  6. A histogram class has width 10 and frequency 30. What is its frequency density?

    • 20
    • 300
    • 3
    • 0.3

  7. If a histogram class has a frequency density of 4 and width 2.5, what is the frequency?

    • 10
    • 6.5
    • 16
    • 1.6

  8. What name is given to making predictions outside the range of original data?

    • Extrapolation
    • Regression
    • Interpolation
    • Correlation

  9. What is calculated by subtracting the lower quartile from the upper quartile?

    • Interquartile range
    • Semi-interquartile range
    • Standard deviation
    • Range

  10. Which measure of central tendency is least sensitive to extreme outlying values?

    • Median
    • Mean
    • Variance
    • Mid-range

  11. On a histogram with total frequency 50, a bar has area 10. What is its relative frequency?

    • 0.2
    • 500
    • 5
    • 0.5

  12. If a scatter plot shows points falling from top-left to bottom-right, what correlation exists?

    • Zero correlation
    • Negative correlation
    • Exponential correlation
    • Positive correlation

  13. Two distinct clusters appearing on a scatter plot indicate the presence of what?

    • Distinct sub-populations
    • Zero correlation
    • Non-linear regression
    • Outliers only

  14. Standard deviation is formally calculated as the square root of which statistical measure?

    • Range
    • Interquartile range
    • Variance
    • Mean deviation

  15. A histogram bar has frequency 18 and frequency density 6. What is the class width?

    • 0.33
    • 108
    • 12
    • 3

  16. Which statistical diagram best displays frequency proportional to area for continuous data?

    • Bar chart
    • Histogram
    • Cumulative frequency plot
    • Scatter diagram

  17. What name describes a correlation caused by a third variable rather than direct link?

    • Spurious correlation
    • Inverse correlation
    • Negative correlation
    • Perfect correlation

  18. What is the variance of a dataset with a standard deviation of 6?

    • 36
    • 2.45
    • 3
    • 12

  19. What does the gradient of a linear regression line estimate in context?

    • Rate of change
    • Total variance
    • Intercept value
    • Correlation coefficient

  20. On a histogram, what does the total area under all bars represent?

    • Probability of one
    • Total class width
    • Mean density
    • Total frequency

All OCR Maths quizzes