QUESTION 31 Given the follawing information. a Calculate the rate of return of the portfoho if the portfolio woights are Wx=.25 and Wy=.75.(2 points) b. Galculate the covariance of two secutties, X and Y, given the portfolio weights Wx=25 and Wy=15. (4 points) c. Using the covanance catculated from part b, citculate the standard deviation of the portiolio, p. (3 points)