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= 40/8
= 5
ragam = [(7-5)² + (4-5)² + (4-5)² + (1-5)² + (6-5)² + (8-5)² + (5-5)²]/8
= (4 + 1 + 1 + 16 + 1 +9 + 0)/8
= 32/8
= 4