Mathematics

13 March, 09:51

Scores of an IQ test have a bell-shaped distribution with a mean of 100 and a standard deviation of 13. Use the empirical rule to determine the following.

(a) What percentage of people has an IQ score between 61 and 139 ?

(b) What percentage of people has an IQ score less than 74 or greater than 126 ?

(c) What percentage of people has an IQ score greater than 126 ?

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