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4.Average
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The average marks of $40$ students in an English exam is $72 .$ Later it is found that three marks $64 , 62$ and $84$ were wrongly entered as $68,65$ and $73.$ The average after mistakes were rectified is
A
$70$
B
$72$
C
$71.9$
D
$72.1$
Solution
Difference $=(64+62+84)-(68+65+73)$ $=210-206=4$
$\therefore \quad$ Correct average $=72+\frac{4}{40}=72.1$
Standard 13
Quantitative Aptitude
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