Tugas 3

$$\begin{array}{rl}\bar{x}& \\ & =\genfrac{}{}{0ex}{}{}{n}\\ 71& \\ 71\times 30& \\ 2130& \\ x_{30}& \\ & \end{array}$$$$\begin{array}{l}1\sum _{i=1}^n{x}_i\\ =\genfrac{}{}{0ex}{}{}{30}\end{array}$$$$\begin{array}{l}1\left(x_1+x_2+\cdots +x_{29}+x_{30}\right)\\ =\left(x_1+x_2+\cdots +x_{29}+x_{30}\right)\\ =\left(2030+x_{30}\right)\\ =2130-2030\\ =100\end{array}$$