Mathematics for IGCSE & O level - Statistical Diagrams (Section 2 - No. 28)
When is it particularly important to use frequency density rather than simply frequency in a histogram?
When the class intervals have equal widths.
When the data is discrete.
When the class intervals have unequal widths.
When the data represents time series.
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Frequency density is essential when class intervals have different widths to avoid misleading representations.