Asked by Sophia

For a set of scores with a mean of 111 and a standard deviation of 8, what is the percentile rank of 90? (round to two decimal places, no leading zeros)

Answers

Answered by PsyDAG
Z = (score-mean)/SD

Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability (.90) and its Z score. Insert in equation above and solve for score.
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