Posted by Juan on .
Find the probability that for a random sample of 4 states the sample mean x is between 475 and 525

Statistics (incomplete) 
PsyDAG,
We do not have your data.
Z = (scoremean)/SEm
SEm = SD/√n
Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability related to the Z scores.