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For observations x1, x2, ........ xn. If n∑i=1 (xi + 1)^2 = 9n and n∑i=1 (xi – 1)^2 = 5n

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For observations x1, x2, ........ xn. If n∑i=1 (xi + 1)2 = 9n and n∑i=1 (xi – 1)2 = 5n then standard deviation of the data is _______

(a) √3

(b) √5

(d) √2

(d) √10

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The correct option (b) √5

Explanation:

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