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OpenStudy (anonymous):
Intelligence quotients (IQ's) on the Standford-Binet intelligence test are normally distributed with a mean of 100 and a standard deviation of 16. Find the IQ score corresponding to a z-score of -2.25.
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Directrix (directrix):
-2.25 = (x - 100)/16 where x is the IQ score corresponding to z-score of -2.25 Cross multiply and solve for x.
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