It is known that 50% of all the items produced by a trial manufacturing process are defective. From a very large output of a single day (over 20,000 items), 400 items are selected at random. Let X be the count of the number of defective items in the random sample. What is (192 220)? (Use the Normal approximation. Use z-scores that actually appear in Table A. Round your final answer to four decimal places. Remember to express your answer as a proportion.)