Suppose that the index model for stocks A and B is estimated from excess returns with the following results: RA = 1.6% + 0.70RM + eA RB = 1.8% + 0.90RM + eB M = 22%; R-squareA = 0.20; R-squareB = 0.15 Assume you create a portfolio Q, with investment proportions of 0.40 in a risky portfolio P, 0.35 in the market index, and 0.25 in T-bill. Portfolio P is composed of 70% Stock A and 30% Stock B.

a. What is the standard deviation of portfolio Q?

b. What is the beta of portfolio Q?

c. What is the "firm-specific" risk of portfolio Q?

d. What is the covariance between the portfolio and the market index?