A data consists of \( n \) observations: \( x_{1}, x_{2} \ldots x_{...

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A data consists of \( n \) observations: \( x_{1}, x_{2} \ldots x_{n} \). If
\( \mathrm{P} \) \( \sum_{i=1}^{n}\left(x_{i}+1\right)^{2}=9 n \) and \( \sum_{i=1}^{n}\left(x_{i}-1\right)^{2}=5 n \), then the

W standard deviation of this data is:
(1) 5
(2) \( \sqrt{5} \)
(3) \( \sqrt{7} \)
(4) 2
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