Posted by Carola on Wednesday, April 27, 2011 at 6:49pm.
the rate of return for an investment can be described by a normal distribution with mean 22% and standard deviation 3%. what is the probability that the rate of return for the investment will be at least 15%?

math  PsyDAG, Thursday, April 28, 2011 at 11:52am
Z = (scoremean)/SD
Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion related to that Z score.