Average marks of students in an examination was 65 . It was later found that marks of one students h

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The average marks of students in an examination was $65 .$ It was later found that the marks of one students had been wrongly entered as $83$ instead of $38.$ the correct average is ?

A

$63.9$

B

$64.5$

C

$64.7$

D

$64.1$

Solution

Correct average $=\frac{50 \times 65-83+38}{58}=64.1$

Standard 13

Quantitative Aptitude

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