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Scores of an IQ test have a​ bell-shaped distribution with a mean of 100 and a...

Scores of an IQ test have a​ bell-shaped distribution with a mean of 100 and a standard deviation of 15. Use the empirical rule to determine the following.

​(a) What percentage of people has an IQ score between 55 and 145​?

​(b) What percentage of people has an IQ score less than 85 or greater than 115​? ​

(c) What percentage of people has an IQ score greater than130​?

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