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Tentukan mean :
mean = 5 + 5 + 7 + 6 + 7 / 5 = 6
Tentukan simpangan baku :
S = Akar (5-6)2 + (5-6)2 + (7-6)2 + (6-6)2 + (7-6)2 / 5
S = Akar (1 + 1 + 1 + 0 + 1) / 5
S = Akar 4/5