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A data consists of 100 observations $$x_{1},x_{2},... x_{100}$$. If $$\sum_{i=1}^{100}(3x_{i}+17)^{2}=22500$$ and $$\sum_{i=1}^{100}(3x_{i}+17)= 900$$, then the standard deviation of $$x_{},x_{2},... , x_{100}$$ is
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