Gujarati
Hindi
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

Similar Questions

Start a Free Trial Now

Confusing about what to choose? Our team will schedule a demo shortly.