The Probabilities of Different Returns on a Stock Over the Year

Multiple Choice

The probabilities of different returns on a stock over the year are: $$\begin{array} {cc } \text { Probability } & \text { Return } \\10 \% & - 5 \% \\15 \% & 0 \% \\20 \% & 5 \% \\30 \% & 10 \% \\25 \% & 20 \%\end{array}$$

The standard deviation of the return on the stock is about_____ percent.

A) 5
B) 8
C) 11
D) 14