Percentage of people


Intelligence Quotient (IQ) in a certain population is normally distributed with a mean of 100 and standard deviation of 15.

(a) What percentage of the population has an IQ between 90 and 125?

(b) What percentage of the population has an IQ more 120?

(c) If the percentage of people who have IQ more than x is 85%. Find the value of x.

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Basic Statistics: Percentage of people
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