Calculate the mean and standard deviation of the portfolio monthly returns, in which the portfolio has two shares. The monthly return of the first share has a mean of 0.8% and a standard deviation of 1.2%, while the monthly return of the second share has a mean of 0.6% and a standard deviation of 1.1%. The two shares have weights of 30% and 70% respectively. Compute your answer with five different correlation assumptions: -0.75, -0.25, 0, 0.25, and 0.75. What is the implication of these results?