posted by julide smith on .
For a population of μ = 70 and σ = 20, find the z-score and percentile rank for each of the following X scores: 80, 100, 65, 40.
Find the p-value of each z-score by looking it up in the z chart.
It'll help you determine the percentile rank if you draw the normal distribution curve.
μ = 70 and σ = 20