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77) rata" = jumlah data/banyak data= (320+280+250+220+200)/5bulan
= 1270/5
= 254 kg (C)
78) rata" = jumlah data / banyak data
= ((6×3)+(7×5)+(8×8)+(9×3)+(10×1c))/(3+5+8+3+1)
= 154/20
= 7,7 nilai rata"ny