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Diket
buku yg terjual 18 lusin = 18 × 12 = 216
maka
Buku = 40°
→ 40/360 × n = 216
1/9 × n = 216
n = 216 × 9
n = 1.944
sehingga jumlah semuanya adalag 1.944
Pensil = 120°
Spidol = 60°
→ Pulpen = 360° - (40° + 120° + 60°)
Pulpen = 360° - 220°
Pulpen = 140°
maka
Pensil
= 120°/360° × 1.944
= ⅓ × 1.944
= 648
Spidol
= 60°/360° × 1.944
= 1/6 × 1.944
= 324
Pulpen
= 140/360 × 1.944
= 7/18 × 1.944
= 756
maka rata ratanya adalah
= (216+648+324+756)/4
= 1.944/4
= 486
rata rata penjualan 486 buah
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Kelas : 9
Mapel : Matematika
Bab : Statistika
Kata kunci : diagram, rata-rata