6 An online artisan paint company sells three sizes of their paints: pint, quart, and half gallon. They also sell brushes designed expressly for their paints. The brushes come in two varieties: a synthetic bristle and a natural bristle. The company has determined that the sales of the two products follow the joint probability distribution shown below. Y X Pint Quart Half Gallon Synthetic 0.05 0.17 0.42 Natural 0.21 0.12 0.03 What is the marginal probability that a randomly-selected paint sale was quart-sized? 0.17 0.12 0.64 0.29