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Posted by **Johnny** on Sunday, October 31, 2010 at 4:11am.

- Statisitcs -
**Johnny**, Sunday, October 31, 2010 at 4:11amCan someone show me how to find this equation to this problem?

Scores on the verbal section of the SAT have a mean of 500 and a standard deviation of 100. If someone scored at the 90th percentile, what is their SAT score?

- Statistics -
**PsyDAG**, Sunday, October 31, 2010 at 11:50amFind table in the back of your statistics text labeled something like "areas under normal distribution" to find the Z score related to that proportion.

Z = (score-mean)/SD

Insert the values and solve for the score.

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