Ononot — Given a dataset X with n=20, \sum{i=1}^{20} xi = 100, and \s

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Given a dataset $X$ with $n=20$ , $\sum_{i=1}^{20} x_i = 100$ , and $\sum_{i=1}^{20} x_i^2 = 800$ . Calculate the sample variance $s^2$ .