Posted by marilyn on .
P(z < 1.5 or z > 2.50) =

statistics 
PsyDAG,
With "or", it is unclear whether you want the probability between the scores, above them or below them.
Assuming that you want the probability between the Z scores, find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability between the Z scores.