Your sister is looking to have a three-stock portfolio. She has $200,000 to invest and she has already selected two other stocks: $40,000 in Facebook with a beta of 2.34 and $20,000 in Walmart with a beta of 1.45. For your third and final selection you have a few stock options to choose from: Amazon with a beta of 0.65, Apple with a beta of 1.33, and AT&T with a beta of 1.95. You would like the overall beta of your portfolio to be as close to "the market" or "average stock" as possible. Make your third selection and calculate the beta of your three-stock portfolio (and yes, I need to see the formula and show all work!)