Suppose Johnson & Johnson and the Walgreen Company have the expected returns and volatilities shown below, with a correlation of 21.8%. Johnson & Johnson Walgreen Company E[R] 6.8% 10.8% SD [R] 15.7% 20.6% For a portfolio that is equally invested in Johnson & Johnson's and Walgreen's stock, calculate: a. The expected return. b. The volatility (standard deviation). .. a. The expected return. The expected return of the portfolio is %. (Round to one decimal place.) b. The volatility (standard deviation). The volatility of the portfolio is %. (Round to one decimal place.)