Posted by marilyn on Saturday, September 7, 2013 at 3:39pm.
P(z < 1.5 or z > 2.50) =

statistics  PsyDAG, Sunday, September 8, 2013 at 2:06pm
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.
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