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s² =[ (5-6)²+(4-6)²+(7-6)²+(8-6)²+(6-6)²+(6-6)²+(5-6)²+(7-6)²]/8
=(1+4+1+4+0+0+1+1)/8
= 12/8 = 3/2
s = √(3/2) = (1/2)√6