Nilai = 5 6 7 8 9 Frekuensi = 8 11 6 4 1 Mean dari data diatas adalah

Bab Statistika
Matematika SMP Kelas VII

Mean = (5 . 8 + 6 . 11 + 7 . 6 + 8 . 4 + 9 . 1)/(8 + 11 + 6 + 4 + 1)
          = (40 + 66 + 42 + 32 + 9) / 30
          = 189 / 30
          = 6,3

Mean = (5 × 6) + (6 × 11) + (7 × 6) + (8 × 4) + (9 × 1) / 8 + 11 + 6 + 4 + 1
Mean = 30 + 66 + 42 + 32 + 9 / 30
Mean = 189 / 30
Mean = 6,3