At a Certain Discount Store, the Number of People in Checkout

Multiple Choice

At a certain discount store, the number of people in checkout lines varies. The probability model for the number of people in a randomly chosen line is: $\begin{array} { l c c c c c c } \text { Number in } & 0 & 1 & 2 & 3 & 4 & 5 \\\text { line } & & & & & & \\\text { Probability } & 0.08 & 0.15 & 0.20 & 0.22 & 0.15 & 0.20\end{array}$
What is the mean number of people in a line?

A) 2.5
B) 15.92
C) 2.81
D) 2.89