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