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OpenStudy (anonymous):
(MEDAL PLUS FAN )IQ scores are normally distributed with a mean of 100 and a standard deviation of 15. If a certain statistician has an IQ of 140, what percent of the population has a lower IQ?
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OpenStudy (anonymous):
you need to work out the z statistc of (X - Mean) / standard deviation and look up the z value in a z table. It is almost 100% from memory but not quite.
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