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= [20+15+12+35+40]/20
= 122/20=6,1
jumlah data
= (4×5) + (5×3) + (6×2) + (7×5) + (8×5)
= 20 + 15 + 12 + 35 + 40
= 122
banyak data
= 5 + 3 + 2 + 5 + 5
= 20
jadi,
rata-rata = jumlah data ÷ banyak data
= 122 ÷ 20
= 6, 1