Tommy is considering investing in a share, but he is aware that the return on that investment is particularly sensitive to how the economy is performing. His analysis suggests that four states of the economy can affect the return on the investment as per the table of returns and probabilities below.

Find the expected return and the standard deviation (risk) of the return on Tommys investment?

Economy States a. Boom b. Good c. Level Probability 0.2 0.4 0.2 0.2 Return 35.00% 20.00% 10.00% -15.00% d. Slump