Ononot — Given a dataset X with n=10 observations, \sum{i=1}^{10} xi

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Given a dataset $X$ with $n=10$ observations, $\sum_{i=1}^{10} x_i = 100$ , and $\sum_{i=1}^{10} x_i^2 = 1500$ , what is the sample variance $s^2$ ?