part a1 is complete, just there for reference. need help with part a2. thanks

Use the table of returns and probabilities above to determine the expected return on Betty's investment? (Round onswer to 3 decimal places, eg. 0.076.) Expected return Betty is considering investing in a company's stock and is aware that the return on that investment is particularly sensitive to how the economy is performing. Her analysis suggests that four states of the economy can affect the retum on the investment. Use the table of returns and probabilities above to determine the standard deviation of the return on Betty's investment? (Round answer to 5 decimal places, e 9.0.07680J Standard deviation