- Home
- Standard 13
- Quantitative Aptitude
4.Average
medium
The average weight of a group of $20$ boys was calculated to be $89.4 kg$ and it was later discovered that one weight was misread as $78 kg$ instead of the correct one of $87 kg$. The correct average weight is in $kg$
A
$88.95$
B
$89.25$
C
$89.55$
D
$89.85$
Solution
Total weight of 20 boys $=89.4 \times 20=1788 kg$
Increase in weight due to misreading $=87-78=9 kg$
Correct weight of 20 boys $=1788+9=1797 kg$
Correct average weight $=\frac{1797}{20}=89.85 kg$
Standard 13
Quantitative Aptitude