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4.5 The extra risk of cancer of group of workers (300) has increased by 5% due to exposure to a certain chemic in a workplace

4.5 The extra risk of cancer of group of workers (300) has increased by 5% due to exposure to a certain chemic in a workplace over that of cohorts who were not exposed. The non-exposed group consist of group of 475 with 25 had developed a cancer. Estimate how many exposed workers in the work space had a cancer

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