Homework Help: Data and statistics

Posted by Beverly on Thursday, July 22, 2010 at 2:43am.

If a student had a z score of 2.5 for IQ, whar is his actual IQ? The IQ mean is 100, and standard deviation is 15.

Data and statistics - drwls, Thursday, July 22, 2010 at 5:50am
(IQ - 100)/15 = 2.5
IQ-100 = 37.5
IQ = 137.5

FYI: It corresponds to the 95.2% percentile. Only 4.8% are higher. That comes from the normal distribution formula.

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