Suppose Johnson & Johnson and the Walgreen Company have the expected returns and volatilities shown below, with a correlation of 21.5% E[R] SD [R] Johnson & Johnson 6.4% 16.9% Walgreen Company 10.4% 19.3% 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 thd portfolio is %. (Round to one decimal place.)