3. Given the monthly returns for ABBV and the S\&P 500 index (a) Calculate the average return for ABBV and the S\&P 500. (b) Calculate the standard deviation of returns for ABBV and the S\&P 500 . (c) What is the correlation between ABBV and the S\&P 500? What is the covariance? (d) We plan to invest 50% of our funds in ABBV (ABBV=50) and the other 50% in the S\&P 500(wSP500=.50). Assume that the average return and standard deviations above are what we expect in the future, that is E[RABBV]=RABBV. What is the expected return of the portfolio? What is the portfolio standard deviation