Math Help Forum - View Single Post - findings mean, SD and approximate distribution

madgab · #1 June 30th, 2009, 08:03 AM

Let X1,X2,....,X81 be a random sample from a distribution (not necessarily normal) with mean $\mu=59$ and SD $\sigma=8$ . Let $\bar{X}=\frac{1}{81}\Sigma^{81}_{i=1}X_{i}$

a) What is the mean of $\bar{X}$
b) What is the standard deviation of $\bar{X}$
c) What is the approximate distribution of $\bar{X}$

I'm not really sure what this question is asking. I know how to find means and standard deviations, but not from what is given in this question. Thank you.