Question: An investor, who thinks the economy is slowing down, wishes to decrease the risk of her portfolio. She currently owns five securities, each with a market value of 4,000 dollar. The current beta of the portfolio is 1.25 & the beta of the riskiest security is 1.8. Determine what will the portfolio beta be if the riskiest security is replaced with a security of equal market value but a beta of 1.2?