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According to an​ almanac, 60​% of adult smokers started smoking before turning 18 years old. ​(a)...

According to an​ almanac, 60​% of adult smokers started smoking before turning 18 years old.

​(a) Compute the mean and standard deviation of the random variable​ X, the number of smokers who started before 18 in 400 trials of the probability experiment.

​(b) Interpret the mean.

​(c) Would it be unusual to observe 360 smokers who started smoking before turning 18 years old in a random sample of 400 adult​ smokers? Why?

Math   Statistics-And-Probability   
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