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Please use excel and show how to find the variance

Suppose Johnson & Johnson and the Walgreen Company have the expected returns and volatilities shown below, with a correlation of 22.0%. E[R] SD [R] Johnson & Johnson 7.0% 16.0% Walgreen Company 10.0% 20.0% 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 8.5 %. (Round to one decimal place.) b. The volatility (standard deviation). The volatility of the portfolio is \%. (Round to one decimal place.)