Homework Help: statistics

Posted by julide smith on Saturday, June 11, 2011 at 6:53pm.

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.

statistics - julide smith, Saturday, June 11, 2011 at 6:54pm
dont know
statistics - TutorCat, Sunday, June 12, 2011 at 2:25am
z=(x-μ)/σ

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.

http://www.mathsisfun.com/data/standard-normal-distribution-table.html
statistics - kim, Wednesday, October 31, 2012 at 10:37pm
μ = 70 and σ = 20

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