Let X1,X2,....,X81 be a random sample from a distribution (not necessarily normal) with mean and SD . Let
a) What is the mean of
b) What is the standard deviation of
c) What is the approximate distribution of
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.
The mean is the same but the SD is divided by ? I never would have known that. What is that SD equation from? Also, how can you figure it is a normal distribution? It is probably obvious but I can't find info like that at all in my book and would like to learn.