In a standard score system with M = 100 and SD = 15, a percentile of 90 will be at approximately what standard score?

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Quizplus · Accepted Answer

A percentile of 90 in a standard score system (like IQ scores) typically corresponds to a standard score that is 1.28 standard deviations above the mean. Given a mean (M) of 100 and a standard deviation (SD) of 15, the calculation would be 100 + (1.28 * 15) = 119.2, which rounds to approximately 120.

In a Standard Score System with M = 100 and SD