Mathematics, 14.07.2019 21:00 carmencolon119

According to an almanac, 70% of adult smokers started smoking before turning 18 years old. (a) if 200 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 160 smokers who started smoking before turning 18 years old in a random sample of 200 adult smokers? why?

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