Solve the Problem

Essay

Solve the problem.
-The amount of rainfall (in inches) in 25 consecutive years in a certain city. $$\begin{array} { | l l l l l | } \hline 20.4 & 25.1 & 22.8 & 27.0 & 23.5 \\24.2 & 26.0 & 25.6 & 23.3 & 24.1 \\21.9 & 27.6 & 24.7 & 25.3 & 21.6 \\31.0 & 23.6 & 26.1 & 25.5 & 24.8 \\18.1 & 22.4 & 24.9 & 30.0 & 29.3 \\\hline\end{array}$$