a)Determine the probability investing in this stock. b. De rate of return less than the risk termine the probability of earning a of 6 percent. 18. Three Rivers Investment Company desires to construct a portfolio with a 20 expected return. The portfolio is to consist of some combination of Secrityen Security , which have the following expected returns, standard deviatic returns, and betas: and op Expected return Standard deviation Beta Security X 15% 10% Security Y 28% 20% 0.94 1.33 Determine the expected beta of the portfolio