Consider the data on two stocks' returns in the following table. a. Estimate the average return and volatility for each stock. b. Calculate the covariance between these two stocks. c. Calculate the correlation between these two stocks. d. With a portfolio of stock X and Y; would you expect that individual stocks' risk cancels out? Explain. e. Suppose stock Z is uncorrelated with stocks X and Y. Will adding Z to a portfolio of X and Y improve on the properties (return / risk) of a portfolio of X and Y alone? Explain