help me please

3. GCC InvestCorp is considering investing in a security that has the following distribution of possible one-year returns: Probability of Occurrence Possible Return 0.1 - 10% 0.2 - 8 % 0.4 10% 0.2 18% 0.1 22 % Determine the Expected Return and Risk (standard deviation) associated with the investment? (5+10=15 marks)