(Expected rate of return and risk) Carter Inc. is evaluating a security. Calculate the investment's expected return and its standard deviation. PROBABILITY RETURN 0.15 6% 0.50 9% 0.20 10% 0.15 15% (Click on the icon located on the top-right corner of the data table above in order to copy its contents into a spreadsheet.) a. The investment's expected rate of return is nothing%. (Round to two decimal places)