Intro Go to Yahoo Finance and download monthly stock price data for Apple (AAPL), Amazon (AMZN) and Alphabet (GOOG) for all of 2015,2016 and 2017. Part 1 Attempt 1/5 for 10 pts. Use the adjusted close prices to calculate monthly returns. What was the arithmetic average monthly return for Alphabet? Part 2 Attempt 1/5 for 10pts. What was the arithmetic average monthly return for a portfolio 10% invested in Apple, 30% invested in Amazon and the remainder in Alphabet? Part 3 Attempt 1/5 for 10 pts. What was the standard deviation of the portfolio