Histogram

 

http://www.analyzemath.com/statistics/histogram.html

Histograms graph a distribution of statistical data but is more of an estimation tool or to find the probability because it focuses on the frequency amounts.  In the histogram above it shows the heights of 30 different people and breaks it down in to categories of centimeters.  The frequency is then plotted by falling into a category of height.  The heights of 30 new people will produce different results.