Okay so I have the answer to this, I just need to know how they got this answer.
A certain species of dolphin breaths a mean of 2.31 times per minute with a variance of 1.28. Given the central limit theorem, if you repeatedly pull 17 dolphins from the population, what will be the variance of the mean of the sampling distribution?

Question

Okay so I have the answer to this, I just need to know how they got this answer. 
A certain species of dolphin breaths a mean of 2.31 times per minute with a variance of 1.28.  Given the central limit theorem, if you repeatedly pull 17 dolphins from the population, what will be the variance of the mean of the sampling distribution?

anonymous · Answer

The answer is .08

anonymous · Answer

I think all you have to do is divide by the sample size.

anonymous · Answer

You can assume the population is large and normally distributed. $$σ_{\bar x}^2 = σ^2/n$$ See http://stattrek.com/sampling/sampling-distribution.aspx