The Number of Customers in a Line at a Supermarket

Multiple Choice

The number of customers in a line at a supermarket express checkout counter is a random variable with the following probability distribution.

$\begin{array} { c | c | c | c | c | c | c } \boldsymbol { x } & 0 & 1 & 2 & 3 & 4 & 5 \\\hline \boldsymbol { P } ( \boldsymbol { x } ) & 0.10 & 0.25 & 0.30 & 0.18 & 0.07 & 0.10\end{array}$

Compute the mean $\mu _ { x ^ { * } }$

A) 0.36
B) 2.17
C) 0.17
D) 0.43