Can someone please help me with the math question? I will give you a shiny medal!

Question

lacris · Answer

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lacris · Answer

B. Since the distribution of blood alcohol concentrations is not normally distributed​ (highly skewed​ right), the sample must be large so that the distribution of the sample mean will be approximately normal. 

I forgot that data obtained must come from a population that is normally distributed or the sample size is n (greater than or equal to) 30 OR, the sample size is 5% or less of the population size. n < 0.05N