Part 1. Tom O'Brien has a 2-stock portfolio with a total value of $100,000. $35,000 is invested in Stock A with a beta of 0.75 and the remainder is invested in Stock B with a beta of 1.42. What is his...

Part 1. Tom O'Brien has a 2-stock portfolio with a total value of $100,000. $35,000 is invested in Stock A with a beta of 0.75 and the remainder is invested in Stock B with a beta of 1.42. What is his portfolio's beta? part 2 You hold a diversified $100,000 portfolio consisting of 20 stocks with $5,000 invested in each. The portfolio's beta is 1.12. You plan to sell a stock with b = 0.90 and use the proceeds to buy a new stock with b = 1.25. What will the portfolio's new beta be? Returns for the Dayton Company over the last 3 years are shown below. What's the standard deviation of the firm's returns? (Hint: This is a sample, not a complete population, so the sample standard deviation formula should be used.) Year Return 2011 21.00% 2010 -12.50% 2009 15.00% 14.47% 15.54% 17.15% 20.36% 17.86%