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xrata-rata = 5+3+6+3+6+2+4+4+2+5 / 10
= 4
SR = 5-4 + 3-4 + 6-4 + 3-4 + 6-4 + 2-4 + 4-4 + 4-4 +2-4 +5-4 / 10
= 0