A data consists of \( \mathrm{n} \) observations: \( \mathrm{x}_{1}... VIDEO
A data consists of \( \mathrm{n} \) observations: \( \mathrm{x}_{1}, \mathrm{x}_{2} \ldots, \mathrm{x}_{\mathrm{n}} \).
\( \mathrm{P}^{10: 5} \)
If \( \sum_{\mathrm{i}=1}^{\mathrm{n}}\left(\mathrm{x}_{\mathrm{i}}+1\right)^{2}=9 \mathrm{n} \) and \( \sum_{\mathrm{i}=1}^{\mathrm{n}}\left(\mathrm{x}_{\mathrm{i}}-1\right)^{2}=5 \mathrm{n} \)
W.
Then the standard deviation of this data is
(1) 2
(2) \( \sqrt{5} \)
(3) 5
(4) \( \sqrt{7} \)
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