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If Σ(i=1→9) (xi -5)=9 and Σ(i=1→9) (xi ​-5)=45 , then the standard deviation of the 9 items x1, x2, ……, x9 is :

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If Σ(i=1→9) (xi -5)=9 and Σ(i=1→9) (xi ​-5)=45 , then the standard deviation of the 9 items x1, x2, ……, x9 is :

(1) 9  (2) 4  (3) 2  (4) 3

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