Mathematics for IGCSE & O level - Statistical Diagrams (Section 4 - No. 28)
What is a 'class interval' in the context of a histogram?
The total number of observations.
The range of values grouped together in a histogram.
The height of each bar in a histogram.
The frequency of a specific data value.
Explication
A class interval is a range of values that are grouped together for display on the x-axis of a histogram.