Scores of an IQ test have a​ bell-shaped distribution with a mean of 100 and a standard deviation of 7.   Use the empirical rule to determine the following. ​(a) What percentage of people has an IQ score between 66 and 134​? ​(b) What percentage of people has an IQ score less than 66 or greater than 34​? ​(c) What percentage of people has an IQ score greater than 117​?

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