Question

The daily rainfall for each day of a week in a certain city is given in millimetres. Find the average rainfall during the week.
9, 11, 8, 20, 10, 16, 12

Answer 1

Average rainfall = $\frac{\mathrm{Sum}\mathrm{of}\mathrm{the}\mathrm{total}\mathrm{rainfall}}{\mathrm{Number}\mathrm{of}\mathrm{days}}$
$$\begin{gathered} =\frac{9+11+8+20+10+16+12}{7} \\ =\frac{86}{7}=12.29\mathrm{mm} \end{gathered}$$