Suppose that the index model for stocks A and B is estimated from excess returns with the following results: R_A = 5.0% + 1.30R_M + e_A R_B = 2.0% + 1.6R_M + e_{B M} = 20%; R-square_A = 0.20; R-square_B = 0.12 What is the standard deviation of each stock? (Do not round intermediate calculations. Round your answers to 2 decimal places.) =