The risk-free rate is 5%. Tom's complete investment portiolio has an expected return of 18% and a standard deviation of return of 23%. Matthew's complete investment portfolio has an expected return of 15% and a standard deviation of retum of 18%. Answer the following: a. Calculate the degree of risk aversion for each investor. b. Interpret the numbers you got from part a). c. Between Tom and Matthew, who is more risk averse? Explain your