Define skewness and kurtosis?

Answer:
Skewness is a measure of symmetry, or more precisely, the lack of symmetry. A distribution, or data set, is symmetric if it looks the same to the left and right of the center point.

Kurtosis is a measure of whether the data are peaked or flat relative to a normal distribution.

See related link. By doing a search on the internet, you can find more examples.
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