Variance | STAT 504 - Statistics Online
https://online.stat.psu.edu/stat504/lesson/variance
WEBVariance is a measure of dispersion, telling us how “spread out” a distribution is. For our simple random variable, the variance is. V (X) = (1− 3.25) 2 (.25) + (2 − 3.25) 2 (.25) + (5 − 3.25) 2 (.50) = 3.1875. A slightly easier way to calculate the variance is to use the well-known identity. V (X) = E(X 2) − (E(X) ) 2.
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