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This is bar graph representing the distribution of data in equal intervals across a continuous range of observations. The vertical bars are clustered reflecting the continuity of the intervals. For each interval or cluster, the frequency of occurrence is a percentage and proportionately represented by a bar.
When there are three different attributes for a data point a Bubble chart is useful. Two values are plotted on the X axis and Y-axis, the third value is represented by the size of the plotted point which becomes a bubble. Often economists, urban planners and geographers use bubble graph in representing Location Quotients.