Credit Sprint / Practice problems / IQ and standard deviations
IQ and standard deviations: practice
Psychology. Try each one, then open the answer. The Credit Sprint app generates unlimited new versions.
A modern IQ test has a mean of 100 and a standard deviation of 15. What IQ score is 0.5 standard deviations above the mean?
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100 + (0.5 × 15) = 107.5.
A modern IQ test has a mean of 100 and a standard deviation of 15. What IQ score is 1 standard deviation below the mean?
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100 − (1 × 15) = 85.
A modern IQ test has a mean of 100 and a standard deviation of 15. What IQ score is 1 standard deviation above the mean?
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100 + (1 × 15) = 115.
A modern IQ test has a mean of 100 and a standard deviation of 15. What IQ score is 1 standard deviation above the mean?
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100 + (1 × 15) = 115.
A modern IQ test has a mean of 100 and a standard deviation of 15. What IQ score is 2 standard deviations below the mean?
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100 − (2 × 15) = 70.
A modern IQ test has a mean of 100 and a standard deviation of 15. What IQ score is 1.5 standard deviations above the mean?
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100 + (1.5 × 15) = 122.5.