please include formulas/work:

B12. (Excel: Calculating means, standard deviations, covariance, and correlation) Given the probability distributions of returns for stock X and stock Y, compute: a. the expected return for each stock, and y b. the variance of the return for each stock c. the covariance between the returns for stock X and stock Y d. the correlation coefficient between the returns for stock X and stock Y. RETURNS Probability Stock X Stock Y -10% 4% 10 20