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24 September, 09:44

IQ scores are normally distributed with a mean of 100 and a standard deviation of 15. If a certain statistician has an IQ of 122, what percent of the population has an IQ less than she does?

A. 7%

B. 22%

C. 93%

D. 99%

E. 47%

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  1. 24 September, 13:23
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    Z = (122-100) / 15 = 22/15 = 1.467

    Then we have to use a z-table for a normal distribution.

    The percent of the population that has an IQ less than she does is C) 93%
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