The following histograms show common distributions to look for when selecting bin size: Five histograms depicting varying common distributions to help select best option for bin size. Histogram A resembles a normal distribution bell curve. Histogram B resembles a decreasing exponential curve that decreases rapidly at first and then slowly approaches 0. Histogram C has resembles two side-by-side bell curves. Histogram D looks like two side-by-side bell curves and the increasing half of an additional bell curve. Histogram E resembles an increasing exponential curve that grows very slowly and first and then rapidly at the end