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Suppose Johnson & Johnson and the Walgreen Company have the expected returns and volatilities shown below, with a correlation of 21.7% ER 73% Johnson & Johnson Walgreen Company SD (R 15.5% 20.9% 10.7% 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)