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.
Forklaring
Frequency density is essential when class intervals have different widths to avoid misleading representations.