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8 Researchers have observed that regular smokers have an average lifespan of 68 years with a standard deviation of 9 years. In a group of

8 Researchers have observed that regular smokers have an average lifespan of 68 years with a standard deviation of 9 years. In a group of 3500 smokers, determine how many of the smokers will live between 75 and 90 years. [4]

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