###
**A school has 4 sections of chemistry in Class X having 40, 35, 45 and 42 students. The mean marks obtained in Chemistry test are 50, 60, 55 and 45 respectively for the 4 sections. Determine the overall average of marks per student.
**

A. 50.25
B. 51.25
C. 52.25
D. 53.25
**Answer: Option C**

## Show Answer

Solution(By Apex Team)

$\begin{array}{l}\text{Average marks}\\
=\left(\Large\frac{50\times40+60\times35+55\times45+45\times42}{40+35+45+42}\right)\\
=\left(\Large\frac{2000+2100+2475+1890}{162}\right)\\
=\Large\frac{8465}{162}\\
=52.25\end{array}$

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