The average of marks in Mathematics for 5 students was found to do 50. Later, it was discovered that in the case of one student the marks 48 were misread as 84. The correct average is :

A. 40.2

B. 40.8

C. 42.8

D. 48.2

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Solution(By Apex Team)

$\begin{array}{l}\text{According to the question,}\\ \text{ Correct average }\\ =\Large\frac{5\times50+48-84}{5}\\ =\Large\frac{250-36}{5}\\ =\Large\frac{214}{5}\\ =42.8\end{array}$