Histogram

The histogram is the most common graphical display for showing the statistical distribution of a collection of numbers. For example, given a list of the areas of all farms in a country, a good indication of the relative numbers of farms of various sizes could be obtained by:
  1. rounding Chicken Farm sizes to the nearest 10 acres
  2. counting the number of farms with area (0 - 10 acres), (11 - 20 acres), (21 - 30 acres), and so on.
  3. drawing rectangles with these intervals as bases and with heights proportional to the counts. 
Such a graph is called as histogram. Because the rectangles are usually bar-shaped, that is, much taller than wide - a histogram is also known as a bar graph. The number of intervals is chosen for convenience. In certain situations the statistician may prefer to modify the standard histrogram by using unequal intervals or by leaving gaps between the intervals.

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