Mathematics for IGCSE & O level - Statistical Diagrams (Section 5 - No. 9)
Which of the following are key features of a histogram?
The area of each bar represents the frequency.
The vertical axis represents frequency density.
The bars are always adjacent to each other.
Used to display the distribution of categorical data.
Explication
A histogram's key features include the area representing frequency, the vertical axis being frequency density, and adjacent bars. It is used for continuous, not categorical, data.