To draw a histogram for this information, first find the class width of each category. The area of the bar represents the frequency, so to find the height of the bar, divide frequency by the class width. This is called frequency density.

Is frequency and density the same?

In fact, for a histogram, the density is calculated from the counts, so the only difference between a histogram with frequencies and one with densities, is the scale of the y-axis. ... For the rest, they look exactly the same.

How do you find the frequency in a histogram?

To find the frequency of each group, we need to multiply the height of the bar by its width, because the area of each bar represents the frequency.