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Statistics Help! Bell shaped distribution

  1. Jan 23, 2012 #1
    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
     
  2. jcsd
  3. Jan 23, 2012 #2

    Simon Bridge

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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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