Suppose Johnson & Johnson and the Walgreen Company have the expected returns and volatilities shown below, with a correlation of 21.8%. E[R] SD [R] Johnson & Johnson 7.9% 15.8% Walgreen Company 10.9% 20.9% 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.)