Suppose that the index model for stocks A and B is estimated from excess returns with the following results: RA = 2.50% + 0.95RM + RB = -1.80% + 1.10RM + B = 27%; R-square = 0.23; R-squareB = 0.11 Assume you create portfolio P with investment proportions of 0.60 in A and 0.40 in B. a. What is the standard deviation of the portfolio? (Do not round your intermediate calculations. Round your answer to 2 decimal places.) Standard deviation % b. What is the beta of your portfolio? (Do not round your intermediate calculations. Round your answer to 2 decimal places.) Portfolio beta