Asked by Raymond
What is the probability that their IQ is above 90?
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Answered by
MathMate
Since IQ scores are assigned according to a normal distribution with a mean of 100 and a standard deviation of 10 points, the probability of a single person's IQ is above 90 is given by the z-score of 0.3413+0.5=0.8413, or 84%.
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