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Histograms and cumulative frequency graphs

Statistics • Statistics

Key concepts

What you'll likely be quizzed about

  • Histograms are graphical representations of frequency distributions using rectangular bars.
  • The width of each bar corresponds to the class interval, while the height represents the frequency of that interval.
  • This visual format allows for a quick assessment of data patterns, such as skewness or the presence of outliers.

Flashcards

Test your knowledge with interactive flashcards

How do you construct a cumulative frequency graph?

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Add the frequencies of each class interval sequentially, then plot these cumulative totals against the upper boundaries of the intervals.

Key notes

Important points to keep in mind

The area of bars in histograms represents frequency.

Cumulative frequency graphs are always non-decreasing.

Use cumulative frequency to find percentiles easily.

Histograms do not show gaps between bars unless a frequency is zero.

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