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%