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The Empirical Rule One measure of intelligence is the Stanford Binet Intelligence Quotient (IQ). IQ scores have a bell-shaped distribution with a mean of 100 and a standard deviation of 15.
(a) What percentage of people has an IQ score between 70 and 130?
(b) What percentage of people has an IQ score less than 70 or greater than 130?
(c) What percentage of people has an IQ score greater than 130?
The Empirical Rule SAT Math scores have a bell-shaped distribution with a mean of 515 and a standard deviation of 114.
Source: College Board, 2010
(a) What percentage of SAT scores is between 401 and 629?
(b) What percentage of SAT scores is less than 401 or greater than 629?
(c) What percentage of SAT scores is greater than 743?