The bivariate random variable (x,Y) takes the values (1,1) with probability 0.25,(2,1) with probability 0.25 , and (1,2) with probability 0.50 . Find the median of x, the variance of Y, and the covariance of x and Y. Let F(x,y) be the distribution function of (x,Y). Find F(1,2). Draw the distribution function of x and the probability function of Y.