The following table shows the probability distribution for a discrete random variable.
X 13 16 18 21 23 25 26 31
P(X) 0.07 0.21 0.17 0.25 0.05 0.04 0.13 0.08
The mean of the discrete random variable X is 20.59. What is the variance of X? Round your answer to the nearest hundredth.

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http://math.elon.edu/statistics112/prob_dist.html

\[s2 = Σ ( x _{I} - x )2 / ( n - 1 )\]

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