Suppose that the index model for stocks A and B is estimated from excess returns with the following results: RA=3.20K+1.10RN+eARB=1.40K+1.25RN+eBM=30B;R-squareeA=0.28;R-squareeB=0.12 Assume you create portfolio P with investment proportions of 0.70 in A and 0.30 in B. a. What is the standard deviation of the portfolio? (Do not round your intermediate calculations. Round your answer to 2 decimal places.) b. What is the beta of your portfolio? (Do not round your intermediate calculations. Round your answer to 2 decimal places.)