Question 3 (10 point). The table below shows monthly excess returns on Apple stock, ICE Boa U.S. Investment Grade Bond Index and the S\&P 500 Index. (a) Using the S\&P 500 index as the market index, estimate market betas of Apple stock and the bond index (8 points) (b) An investor would like to hold a portfolio made up of Apple stock and bond index. She would like a portfolio beta of 0 . What are the portfolio weights of Apple stock and the bond index? (2 points)