Posted by Anonymous on Tuesday, November 8, 2011 at 1:09am.
Assume that blood pressure readings are normally distributed with a mean of 123 and a standard deviation of
9.6. If 144 people are randomly selected, find the probability that their mean blood pressure will be less than 125

statistics  PsyDAG, Tuesday, November 8, 2011 at 10:18am
Z = (mean1  mean2)/SEm
SEm = SD/√n
Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion related to the Z score. 
statistics  Anonymous, Monday, March 19, 2012 at 10:58pm
0.9938