Find the Mean of the Given Probability Distribution $\begin{array}{c|c}x & P(x) \\\hline 3 & 0.14 \\6 & 0.22 \\9 & 0.36 \\12 & 0.18 \\15 & 0.10\end{array}$

Multiple Choice

Find the mean of the given probability distribution.
-The number of golf balls ordered by customers of a pro shop has the following probability distribution.

$\begin{array}{c|c}x & P(x) \\\hline 3 & 0.14 \\6 & 0.22 \\9 & 0.36 \\12 & 0.18 \\15 & 0.10\end{array}$

A) $\mu = 9$
B) $\mu = 8.88$
C) $\mu = 5.97$
D) $\mu = 8.64$