A set of $20$ data values $\{x_1, x_2,\dots,x_{20}\}$ has $\sum\limits_{i=1}^{20} x_i^2 = 2872$ and $\mu=11$. Find the variance of the data set.
The answer given is 22.6
2026-04-03 01:00:34.1775178034
How to find variance given mean and sum of square numbers?
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