If you could explain this without excel because its going to be on a test that would be great! Thanks in advance

38. Suppose You plan to invest in Stock X, Stock Y, or some combination of the two. The expected return for X is 10% and standard deviation for X is 5%. The expected return for Y is 12% and the standard deviation for Y 6%. The correlation wellicient for X and Y is 0.75. Calculate the expected return and standard deviation for the portfolios for 100%, 75%, 50%, 25%, and 0% in Stock X. ID = X(rx) + (1 - X)(ry)