In a group of data, there are \( n \) observations, \( x, x_{2}, \l...

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In a group of data, there are \( n \) observations, \( x, x_{2}, \ldots, x_{n} \). If \( \sum_{i=1}^{n}\left(x_{i}+1\right)^{2}=9 n \) and \( \sum_{i=1}^{n}\left(x_{i}-1\right)^{2}=5 n \),
P the standard deviation of the data is (2019 Main, 9 Jan II)

W
(a) 2
(b) \( \sqrt{7} \)
(c) 5
(d) \( \sqrt{5} \)
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