You have been given this probability distribution for the holding-period return for a stock: Stock of the Economy Probability Boom 0.40 0.35 Normal growth Recession 0.25 HPR 22% 11% - 9% - What is the expected standard deviation for the stock?

You have been given this probability distribution for the holding-period return for a stock: \begin{tabular}{lcr} Stock of the Economy & Probability & HPR \\ \hline Boom & 0.40 & 22% \\ Normal growth & 0.35 & 11% \\ Recession & 0.25 & 9% \\ \hline \end{tabular} What is the expected standard deviation for the stock