Question

Find the sum of $8$ numbers whose mean is $13$.

Answer 1

Total numbers $=8$

Mean $=\frac{\text{Sum of 8 numbers}}{8}$

and Mean is given as $13$.

Therefore,

Sum of $8$ numbers $=$Mean $\times 8$

$$\begin{gathered} =13\times 8 \\ =104 \end{gathered}$$

Hence the sum of $8$ numbers whose mean is $13$ is $104$.