Statistics and Probability Dictionary

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Skewness

When they are displayed graphically, some distributions of data have many more observations on one side of the graph than the other. Distributions with fewer observations on the right (toward higher values) are said to be skewed right; and distributions with fewer observations on the left (toward lower values) are said to be skewed left.

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Skewed right Skewed left
See also:   AP Statistics Tutorial: Graphical Display of Data