Membership in Mensa requires an IQ score above 131.5. Nine candidates take IQ tests, and their summary results indicate that their mean IQ score is 133. IQ scores are normally distributed with a mean of 100 and a standard deviation of 15. If one person is randomly selected from the general population, find the probability of getting someone with an IQ score of at least 133.
a) 0.9861
b) 0.8810
c) 0.1190
d) 0.0139
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