Year 11 Maths B
posted by Rianna on .
The mean mass of 35 bags of potatoes on a truck is 49 kg. Eight more bags of mean mass 53 kg are added to the truck. What is the new mean mass of the potatoes? Round your answer to the nearest whole kg.

n1=35, total mass, m1 = 35*49 = 1715
n2=8, total mass, m2 = 8*53 = 424
Total bag count = n1+n2
total mass = m1+m2
New mean mass = (m1+m2)/(n1+n2) 
So does that mean
n1=35
n2=8
m1=1715
m2=424
Total bag count: 43
Total Mass: 2139
New mean mass: 49.74418605
Round it to the nearest kilo
50kg.
Is that correct??? 
Perfect!