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IQ scores. IQ scores have a mean of 100 and a standard deviation of 15. Kelly Stewart has an IQ of 130. a. What is

IQ scores.IQ scores have a mean of 100 and a standard deviation of 15. Kelly Stewart has an IQ of 130.

a. What is the difference between Kelly's IQ and the mean? 30

b. How many standard deviations is that (the difference found in part a)?

c. What percent of people have an IQ higher than Kelly's?

d. What percent of people have an IQ lower than Kelly's?

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