Question

If the average weight of 6 students is 50 kg; that of 2 students is 51 kg; and that of other 2 students is 55 kg; then the average weight of all students is

• A. 52 kg
• B. 51.2 kg
• C. 51.5 kg
• D. 61 kg

Answer 1

Answer:

B. 51.2 kg

average weight=(50×6+51×2+55×2)/10 = 300+102+110/10 = 51.2 kg