# Dictionary:Kurtosis

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(kur tō’ sis) A measure of the sharpness of a population distribution. If x10, x25, x75, and x90 are the values for which 10, 25, 75, and 90% of the population is smaller, respectively, then

${\displaystyle {\text{kurtosis}}={\frac {x_{75}-x_{25}}{2(x_{90}-x_{10})}}}$

From the Greek word for "curvature".