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a standardized test has a mean of 88 and a standard deviation of 12. What is the score at thr 90th percentile? Assume a normal distribution.
14 years ago

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PsyDAG
Find 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

Plug in the values and solve.
14 years ago

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