Can someone help with 8-1 (a-c)? Please show all work! Thanks!

RISK AND RETURN CONCEPTS AND RETURN CONCEPTS KE ude this chapter, we summarize some risk/return o conclude concepts that were discussed eff ris el In finance, we define risk as the chance that you will not receive the return that you expect, regardless of whether the actual outcome is better than expected or worse than expected. Riskier investments must have higher expected returns than less risky investments; otherwise, people will not purchase investments with higher risks. , The total risk of any investment can be divided into two components: diversifiable risk and nondiver- sifiable risk. Diversifiable risk is not important to informed investors, because they will eliminate its PROBLEMS What are the (a) expected return, (b) standard deviation, and (c) coefficient of variation for an investment with the following probability distribution? 8-1 Probability 0.2 0.7 0.1 Payoff 19.0% 9.0 4.0