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If a data set has outliers, they are marked as separate points to the left and/or right of the whiskers. A box plot is a scaled figure and is usually presented above a number line. The set of numbers used to draw the box plot is called the five-number summary of the data set. Each of the five numbers is labeled below.
A box plot provides a visual illustration of the distribution of a data set. Each segment of the plot contains one quarter, or 25%, of the data, and the center 50% of the data lies inside the box. The further apart the segments are, the greater the spread is for that quarter of the data.