Mathematics for IGCSE & O level - Statistical Diagrams (Section 6 - No. 21)
What is the relationship between frequency, class width, and frequency density in a histogram?
Frequency = Frequency Density / Class Width
Frequency Density = Frequency * Class Width
Frequency = Frequency Density * Class Width
Frequency Density = Frequency + Class Width
Explanation
This is the definition of frequency density.