Question

In a class of $50$ students, the average marks of $20$ student in English is $70$ and that of the remaining $30$ is $80$. Find the class average?

Answer 1

Given in a class of $50$ students, the average marks of $20$ student in English is $70$ and that of the remaining $30$ is $80$.

Then the class average of $50$ students in English is

$=\frac{20\times 70+30\times 80}{50}$

$=\frac{1400+2400}{50}$

$=\frac{3800}{50}$

$=76$.

So the class average is $76$.