The document describes calculating the mean return and standard deviation of a portfolio invested 20% in asset X with a mean return of 8% and standard deviation of 10%, and 80% in asset Y with a mean return of 6% and standard deviation of 5%. The mean return of the portfolio is 14% since it is a weighted average of the individual asset returns. The standard deviation of the portfolio is 11.01% since it is calculated based on the variances and covariance of the individual assets weighted by their allocation in the portfolio.