Please help me please

As an investment analyst, you have just been provided information on the results of two companies' shares, being those of companies X and Y. The information on the expected returns and standard deviations as shown below: Assume that the correlation coefficient between the two companies' shares is 0.3 . Calculate the expected return and standard deviation for the following portfolio: a) 90% in X and 10% in Y; b) 65% in X and 35% in Y; c) 60% in X and 40% in Y; d) 35% in X and 65% in Y; e) 10% in X and 90% in Y