A random variable X has the probability function as given in the table to the right. It is easy to show that the mean value is 5. Find the variance of X. X P(X) 3 0.2 5 0.6 7 0.2

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A random variable X has the probability function as given in the table to the right.  It is easy to show that the mean value is 5.  Find the variance of X.

X P(X)
3 0.2
5 0.6
7 0.2
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