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akar ( 1/5 ( 2-5)^2 + (3-5)^2 + (5-5)^2 + (6-5)^2 + (9-5)^2 ) )
akar ( 1/5 ( 9 + 4 + 0 + 1 + 16 )
maka simpangan bakunya adalah akar6 ....