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Chapter 3 Review Homework Question 11
Chapter 3 Review Homework
11
Scores of an IQ test have a bell-shaped distribution with a mean of 100 and a standard deviation of 20. Use the empirical rule to determine the following.
(a) What percentage of people has an IQ score between 80 and 120?
(b) What percentage of people has an IQ score less than 60 or greater than 140 ?
(c) What percentage of people has an IQ score greater than 160?