# statistics

Scores on a recent national statistics exam were normally distributed with a mean of 80 and a standard deviation of 6.
What is the percentile rank of a score of 89?

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1. Z = (score-mean)/SD

Look up Z score on table in back ofr stats text labeled something like "areas under the normal distribution" to get proportion corresponding to the percentile rank (proportion equal to or below that score).

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posted by PsyDAG
2. 12.5

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posted by russ

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