Find the expected rate of return and return standard deviation for the portfolio with 50% HT and 50% in Coll. (attached). Show your details - Show your formulae.

\begin{tabular}{lccc} Economy & Prob & HT & Coll \\ \hline Recession & 0.1 & 29.5% & 24.5% \\ Below avg & 0.2 & 9.5% & 10.5% \\ Average & 0.4 & 12.5% & 1.0% \\ Above avg & 0.2 & 27.5% & 5.0% \\ Boom & 0.1 & 42.5% & 20.0% \end{tabular}