Machine Malfunctions y f(x,y) 135 x 1 2 3 0.05 0.10 0.15 0.05 0.05 0.35 0.00 0.20 0.05 Let X denote the number of times a certain numerical control machine will malfunction: 1, 2, or 3 times on any given day. Let Y denote the number of times a technician is called on an emergency call. Their joint probability distribution is given in the accompanying table. Determine the covariance between X and Y. Click the icon to view the joint probability distribution of X and Y. OXY (Type an integer or a decimal. Do not round.)