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24.04.2021 •
Mathematics
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Ответ:
The Mean and standard deviation of random variable
is 
Respectively.
The given problem describes a binomial distribution with
a)The mean is given by;
The standard deviation is given by the formula,
b)The mean means that in an experiment of
adult smokers,
of adult smokers started smoking before turning 
years old so on an average 
smokers who started smoking before turning 
years.
c)It would be unusual to observe
smokers who started smoking before turning 
years old in a random sample of 
adult smokers because 
is far greater than the mean of the distribution. 
is greater than the standard deviations from the mean of the distribution.
Learn more about Standard deviation concept here,
link