Your client decides to invest in your risky portfolio a proportion $($y$)$ of his

total investment budget with the remainder in a Tbill money market fund so

that his complete portfolio will have an expected rate of return of $15\%.$

b$\mathrm{.}1$ What is the proportion y$?$ What are your client's investment proportions in

your three stocks and the Tbill fund?

b$\mathrm{.}2$ What is the standard deviation of the rate of return on your client's

portfolio?