GCSE Maths (AQA)

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Uneven Histograms

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Statistics Statistics

Uneven Histograms

8:07 Histograms
Spec S3 S4
Previous Even Histograms Next Estimations from Histograms
  • A histogram represents the frequency of data items within a continuous range
  • The area of the bars in a histogram represents the frequency, not the height
  • Frequency density is a measure of frequency per unit data in a class's range
  • Frequency density is calculated by dividing the frequency by the class width
  • The height of a bar in a histogram represents its frequency density
  • The area of a bar in a histogram is equal to its height (frequency density) multiplied by its width (class width)
  • Histograms help visualize both the frequencies and how densely packed they are
  • If all class widths are the same, frequency can be plotted on the y-axis instead of frequency density
  • To analyze an uneven histogram, determine the class ranges, calculate the frequency density, deduce the scale for the vertical axis, determine the frequency density and class width for each bar, and calculate the frequency for each bar.

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