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 320 smokers who started smoking before turning 18 years old in random sample of 400 adult​ smokers? Why?

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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 320 smokers who started smoking before turning 18 years old in  random sample of 400 adult​ smokers? Why?
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