SOLUTION: Suppose standard IQ scores are known to be normally distributed with mean of 100 and standard deviation of 15. Find the probability that a randomly selected individual with IQ scor
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Question 909684: Suppose standard IQ scores are known to be normally distributed with mean of 100 and standard deviation of 15. Find the probability that a randomly selected individual with IQ score between 90 and 120. Answer by stanbon(75887) (Show Source):
You can put this solution on YOUR website! Suppose standard IQ scores are known to be normally distributed with mean of 100 and standard deviation of 15. Find the probability that a randomly selected individual with IQ score between 90 and 120.
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z(90) = (90-100)/15 = -2/3
z(120) = (120-100)/15 = 4/3
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P(90< x <120) = P(-2/3 < z < 4/3) = normalcdf(-2/3,4/3) = 0.6563
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Cheers,
Stan H.
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