Solve the Problem $\begin{array} { l l l l l l } 7.5 & 8.5 & 8.3 & 8.0 & 8.3 & 7.5 \end{array}$

Solve the problem.
-Bill kept track of the number of hours he spent exercising each week. The results for four months are shown below. Find the mean number of hours Bill spent exercising per week. Round your
Answer to the nearest tenth of an hour. $\begin{array} { l l l l l l } 7.5 & 8.5 & 8.3 & 8.0 & 8.3 & 7.5 \end{array}$
$\begin{array} { l l l l l l } 8.2 & 8.3 & 6.5 & 7.5 & 8.0 & 7.9 \end{array}$
$\begin{array} { l l l l l l } 7.4 & 8.5 & 8.5 & 7.8 & 8.3 & 8.2 \end{array}$

A) $8.2$ hours
B) $8.0$ hours
C) $7.5$ hours
D) $8.4$ hours