HELP PLEASE!!!
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 60 or greater than 140.
c. what percentage of people has an IQ score greater than 160

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how would i figure those out though?

http://en.wikipedia.org/wiki/68-95-99.7_rule

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