Question

Find the mean of x, x + 2, x + 4, x + 6, x + 8.

Answer 1

Mean = $\frac{\mathrm{Sum}\mathrm{of}\mathrm{o}\mathrm{bservations}}{\mathrm{Number}\mathrm{of}\mathrm{observations}}$

$$\begin{gathered} \Rightarrow \mathrm{Mean}=\frac{x+x+2+x+4+x+6+x+8}{5} \\ \Rightarrow \mathrm{Mean}=\frac{5x+20}{5}=\frac{5(x+4)}{5} \\ \Rightarrow \mathrm{Mean}=x+4. \end{gathered}$$