A histogram displays the distribution of values for a single measure. A series of
bars represents the number of observations in the measure that match a specific value
or value range. The
bar height can represent either the exact number of observations or the percentage of all observations
for each value range.
Note: If you use the default number
of bins, then the minimum and maximum values on the histogram axis
might not match the actual extent of your data values. If you specify
the number of histogram bins, then the histogram axis matches your
data values exactly.