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rata" = jmlh nilai/jmlh siswa =271/40 = 6.775
= ((5 × 3) + (5,5 × 4) + (6 × 6) + (6,5 × 8) + (7 × 7)
+ (7,5 × 2) + (8 × 6) + (8,5 × 4)) : (3 + 4 + 6 + 8 + 7 + 2 + 6 + 4))
= (15 + 22 + 36 + 52 + 49 + 15 + 48 + 34) : 40
= 271 : 40
= 6,775