Risk and return You are considering an investment in the stock market and have identified two potential stocks, they are Rio Tinto (NYSE: RIO) and Amazon (NASDAQ: AMZN). The historical prices for the past 9 years are shown in the table below. Year 2010 2011 2012 2013 2014 2015 2016 2017 2018 Rio Tinto 48.51 69.48 60.46 56.47 53.15 44.13 24.65 44.79 56.11 Amazon 125.41 169.64 194.44 264.27 358.69 354.53 587.00 823.48 1450.89 1. (5 marks) Calculate the return and risk (standard deviation) of each stock. Which stocks would you prefer to own? Explain your answer(s) 2. (8 marks) Calculate the correlation coefficient between the two stocks. Does it appear that a portfolio consisting of RIO and AMZN would provide good diversification? Explain your answer(s). 3. 7 marks) Calculate the expected (annual) return and standard deviation if you owned a portfolio consisting of 80% in AMZN and 20% in RIO