In a piston assembly, the specifications for the clearance between piston rings and the cylinder wall are very tight. In a lot of assemblies, let X be the number with too little clearance and let y be the number with too much clearance. The joint probability mass function of X and Y is given the table below: X 0 1 2 3 0 0.15 0.09 0.06 0.04 y 1 0.12 0.07 0.05 0.03 2 0.11 0.05 0.04 0.02 3 0.10 0.04 0.02 0.01 Find the marginal probability mass function of X. (Round the final answer to two decimal places.) PX(0) PX(1) PX(2) PX(3)

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