Mathematics for IGCSE & O level - Statistical Diagrams (Section 3 - No. 46)
Which of the following statements about histograms is true?
Histograms are used for categorical data.
Histograms have gaps between the bars.
The area of each bar represents the frequency.
The y-axis represents the class width.
Giải thích
The area represents the frequency, especially important when widths vary