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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 20.

Use the empirical rule to determine the following.

​(a) What percentage of people has an IQ score between 40 and 160​?

​(b) What percentage of people has an IQ score less than 40 or greater than 160​?

​(c) What percentage of people has an IQ score greater than 120​?

Math   Statistics-And-Probability   
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