Statistics Help! Bell shaped distribution

  • Thread starter Jazigirl
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  • #1
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Suppose that IQ scores have a bell shaped distribution with a mean of 104 and a standard deviation of 14. Using the empirical rule what percentage of IQ scores are less than 76? Please do not round your answer.

So far this is what i have

76 -104= -28

-28
__ = -2
14

*How do I obtain the percentage?
*When I get to this point I get lost can someone help me out please and thank you
 

Answers and Replies

  • #2
Simon Bridge
Science Advisor
Homework Helper
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You use the "empirical rule"

"percentage less than 76" has been converted (by you, just now) into "percentage less than 2 standard deviations" ... you should have notes for the percentage within a certain number of standard deviations of the mean.
 

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