Let $\overline{t}$ denote the mean of the points $t_1, \ldots, t_m$, i.e., $\overline{t} = \frac{1}{m} \sum_{i=1}^m t_i$. Similarly, let $\overline{t^2}$ denote the mean of the squares of these points, i.e., $\overline{t^2} = \frac{1}{m} \sum_{i=1}^m t_i^2$.
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