Ononot — Given a dataset with n=10 and \sum{i=1}^{10} xi = 100 and \s

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Given a dataset with $n=10$ and $\sum_{i=1}^{10} x_i = 100$ and $\sum_{i=1}^{10} x_i^2 = 1200$ , what is the population variance $\sigma^2$ ?