Question

The algebraic sum of the deviation of $20$ observation measured from $30$ is $2$ . Then find the mean of observation.

Answer 1

Answer: 30.10

$\sum _{i=1}^{20}\left(x_i-30\right)=2$
$\left(x_1+x_2+\dots \dots \dots +x_{20}\right)=602$
$\bar{x}=\frac{x_1+x_2+\dots ..+x_{20}}{20}=\frac{602}{20}=30.1$