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Assume that adults have IQ scores that are normally distributed, with a mean of 107 and...

Assume that adults have IQ scores that are normally distributed, with a mean of 107 and a standard deviation of 15. Find the probability that a randomly selected individual has an IQ between 75 and 117.

Math   Statistics-And-Probability   
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Answer #1

Let X denote the IQ score of an adult

We are given :

Required probability = Probability that a randomly selected individual has an IQ between 75 and 117 = P(75 < X < 117)

We use Excel function "NORMSDIST()" as :

Hence,

Probability that a randomly selected individual has an IQ between 75 and 117 = 0.731

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