Question

A group of people contains men, women and children. If 40% of them are men, 35% are women and rest are children, and their average weights are 70 kg, 60 kg and 30 kg, respectively. The average weight of the group is:

• A. 45.5 kg
• B. 56.5 gm
• C. 45.5 gm
• D. 56.5 kg

Answer 1

Answer:

D. 56.5 kg

$average weight =0.4\times 70+0.35\times 60+0.25\times 30$

$=28+21+7.5=56.5$