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IQ is normally distributed with a mean of 100 and a standard deviation of 15. Suppose one individual is randomly chosen. Let X=IQ of an individual.   (a) Find the probability that the person has an IQ greater than 120. (b) Mensa is an organization whose members have the top 2% of all IQs. Find the minimum IQ needed to qualify for the Mensa organization. (c) The middle 50% of IQs fall between what two values?

- August 24, 2022 - Edwin Tunner

 

(5) IQ is normally distributed with a mean of 100 and a standard deviation of 15. Suppose one individual is randomly chosen. Let X=IQ of an individual.

 

(a) Find the probability that the person has an IQ greater than 120.

(b) Mensa is an organization whose members have the top 2% of all IQs. Find the minimum IQ needed to qualify for the Mensa organization.

(c) The middle 50% of IQs fall between what two values?

 

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