Question

If in a class of $20$ students, $5$ students have scored $76$ marks, $7$ students have scored $77$ marks and $8$ students have scored $78$ marks, then compute the mean of the class.

Answer 1

As per given data,

The total marks obtained by $5$ students $=5\times 76=380$

Total marks obtained by $7$ students $=7\times 77=539$

Total marks obtained by $8$ students $=8\times 78=624$

Then total marks obtained by $20$ students $=380+539+624=1543$

Then, mean of the class $=\frac{1543}{20}=77.15$