find standard deviation

(Related to Checkpoint 7.1) (Expected rate of return and risk) B. J. Gautney Ent and its standard deviation. Should Gautney invest in this security? Probability Return 0.10 -5% 0.50 4% 0.30 7% 0.10 8% (Click on the icon in order to copy its contents into a spreadsheet.) a. The investment's expected return is 4.40 %. (Round to two decimal places.) b. The investment's standard deviation is %. (Round to two decimal places.)