Posted by jackee on .
For a population of μ = 70 and σ = 20, find the zscore and percentile rank for each of the following X scores: 80, 100, 65, 40.

statistics 
PsyDAG,
Z = (scoremean)/SD
Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability below each Z score.