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Verified answer
Rata-rata 20 bilangan = 45(12 . 50 + 6 . 42 + 2 . x)/20 = 45
(600 + 252 + 2x) = 20 (45)
852 + 2x = 900
2x = 48
x = 24
Verified answer
Rata-rata = 45banyak bilangan = 20
maka jumlah bilangan = 20 × 45 = 900
Rata-rata (1) = 50
banyak bilangan = 12
maka jumlah bilangan = 12 × 50 = 600
Rata-rata (2) = 42
banyak bilangan = 6
maka jumlah bilangan = 6 × 42 = 252
Rata-rata (3) = jumlah bilangan/banyak bilangan
............................900 - 600 - 252
Rata-rata (3) = ---------------------------
.................................20 - 12 - 6
............................ 48
Rata-rata (3) = ------
.............................2
Rata-rata (3) = 24
Jadi rata-rata bilangan 2 terakhir adalah 24