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

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Descriptive Statisticshard

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Given a dataset $X$ with $n=10$ observations, where $\sum_{i=1}^{10} x_i = 100$ and $\sum_{i=1}^{10} x_i^2 = 1200$ . If we transform the data by $y_i = 3x_i - 5$ , what is the variance $\sigma_y^2$ of the new dataset?