Check my work Use the following information on states of the economy and stock returns to calculate the standard deviation of returns. (Do not round intermediate calculations. Enter your answer as a percent rounded to 2 decimal places.) Probability of State of State of Economy Economy Recession .35 Normal . 20 Boom .45 Security Return if State Occurs -5.50% 12.00 19.00 Standard deviation Check my work Use the following information to calculate the expected return and standard deviation of a portfolio that is 60 percent invested in 3 Doors, Inc., and 40 percent invested in Down Co.: (Do not round intermediate calculations. Enter your answers as a percent rounded to 2 decimal places.) Expected return, E(R) Standard deviation, o Correlation 3 Doors, Inc. 16% 46 Down C 14% 48 31 Expected return Standard deviation %