Asked by kim

the average score on the statistics quiz was a 70, and there was a standard deviation of 10 points. If the z-socre was -1.0 what is the percentile rank?

11 years ago

Answered by PsyDAG

Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability related to the Z score. Percentile rank is the proportion below a particular score.

OR…

http://davidmlane.com/hyperstat/z_table.html

11 years ago

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