(a) What is the probability that an infant will have one or more episodes of otitis media by the end of the sixth month of life? What is the probability that an infant will have one or more episodes of otitis media by the end of the first year of life? (b) What is the probability that an infant will have one or more episodes of otitis media by the end of the ninth month of life given that no episodes have been observed by the end of the third month of life? (Round your answer to four decimal places.) (c) Suppose "otitis-prone family is defined as one in which at least three siblings of five develop otitis media in the first 6 months of life. What proportion of five-sibling families is otitis prone if we assume the disease occurs independently for different siblings in a family? (Round your answer to four decimal places.)

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