According to an?almanac, 70?% of adult smokers started smoki

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According to an? almanac, 70?% of adult smokers started smoking before turning 18 years old.

?(a) If 100 adult smokers are randomly? selected, how many would we expect to have started smoking before turning 18 years? old?

?(b) Would it be unusual to observe 85 smokers who started smoking before turning 18 years old in a random sample of 100 adult? smokers? Why?

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