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If a data consisting of 25 observations $$\sum_{i=1}^{25}(x_{i} + 9)^{2} = 175$$ and $$\sum_{i=1}^{25}(x_{i}+9) =\frac{75}{2}$$, then the standard deviation of data is
$$\frac{9}{2}$$
$$\frac{19}{4}$$
$$\frac{\sqrt{19}}{2}$$
$$\frac{3}{\sqrt{2}}$$
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