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x bar = 3+4+4+5+5+6+6+7 / 8 = 40/8 = 5
maka :
S² = (3-5)²+(4-5)²+(4-5)²+(5-5)²+(5-5)²+(6-5)²+(6-5)²+(7-5)²
N - 1
= 4+1+1+0+0+1+1+4
8-1
= 12/7