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4.Average
easy
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 $87 \,kg.$ The correct average weight is (in $kg.$)
A
$88.95$
B
$89.25$
C
$89.55$
D
$89.85$
Solution
Sum of the weight of $20$ boys $=89.4 \times 20=1788 \,kg$
According to the question.
New Average $=1788-78+87=\frac{1797}{20}=89.85\, kg$
Standard 13
Quantitative Aptitude
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