A project has a 0.7 chance of doubling your investment in a year and a 0.3 chance of halving your investment in a year. What is the standard deviation of the rate of return on this investment? Assume the risk-free rate of a stock is 8% and the expected rate of return on the market is 18%. If the stock has an expected return of 6%. What is its beta? Assume both portfolios A and B are well diversified, that E (rA) = 14% and E (r3) = 14.8%. If the economy has only one factor, and bA = 1 while bB = 1.1, what must be the risk-free rate