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Find the standard deviation of 2,3,8,10 and 12

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Find the standard deviation of 2,3,8,10 and 12

A.

3.9

B.

4.9

C.

5.9

D.

6.9

Correct answer is A

x(xϰ)(xϰ)22525341681110391252576

S.D = (xϰ)2n

S.D = 765

S.D = 3.9