If \( \mathrm{x}_{1}, \mathrm{x}_{2}, \ldots ., \mathrm{x}_{18} \) ...

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If \( \mathrm{x}_{1}, \mathrm{x}_{2}, \ldots ., \mathrm{x}_{18} \) are observations such that
\( \mathrm{P}^{12} \) \( \sum_{\mathrm{j}=1}^{18}\left(\mathrm{x}_{\mathrm{j}}-8\right)=9 \) and \( \sum_{\mathrm{j}=1}^{18}\left(\mathrm{x}_{\mathrm{j}}-8\right)^{2}=45 \), then standard

W. deviation of these observations is
(1) \( \sqrt{\frac{81}{34}} \)
(2) 5
(3) \( \sqrt{5} \)
(4) \( \frac{3}{2} \)
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