Consider the following information: rate of return if state occurs state of probability of economy state of economy stock a stock b recession .15 .04 − .15 normal .61 .07 .14 boom .24 .12 .31 a. calculate the expected return for stocks a and b. (do not round intermediate calculations and enter your answers as a percent rounded to 2 decimal places, e. g., 32.16.) b. calculate the standard deviation for stocks a and b. (do not round intermediate calculations and enter your answers as a percent rounded to 2 decimal places, e. g., 32.16.)