Histogram

Such distinctions, however, require detailed information, such as histograms of the distribution of energy use among residential customers, both by month and by year.

The use of the piecewise linear frequency polygon (FP) in place of the underlying histogram would seem mainly a graphical advantage.

A histogram is constructed by placing the variable of interest on the horizontal axis and the frequency, relative frequency or percent frequency on the vertical axis.[…]Histograms for data found in applications are never perfectly symmetric, but the histogram for many applications may be roughly symmetric.