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sb = akar ((2-5)^2 + (8-5)^2+ (5-5)^2 + (7-5)^2 + (3-5)^2 )÷ 5
= akar (9+9+0+4+4) ÷ 5
= akar 26 ÷5
=akar 5,2 = 2,28