The histogram below shows the populations of each of the 39 counties in Washington state, according to the 2000 Census. Image Caption: This graph shows frequencies associated with the populations of counties in Washington State. Data table is below.

# of countries	population
28	100,000
3	200,000
3	300,000
1	400,000
1	500,000
1	700,000
1	800,000
1

What term best describes this histogram