Calculate the mean monthly returns and standard deviations for each of the Dow 30 stocks (in Exhibit 2) over January 1990 to June 1998 period. Compare the mean return and standard deviation relation across the Dow 30 stocks versus the mean return and standard deviation relation across the various asset classes from Exhibit 1. Compute the mean return and the standard deviation of 2-stock portfolio consisting of Exxon and General Electric. Compare the portfolio stande deviation to the average standard deviation of the two stocks. Repeat the analysis for General Electric and General Motors