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Statistics question

  1. Sep 27, 2007 #1
    The problem goes as such;

    The scale of scores on an IQ test is approximately Normal with mean 100 and standard deviation 15. The organization MENSA, which calls itself "the high-IQ society," requires an IQ score of 130 or higher for membership. What percent of adults would qualify for membership?

    I know I can use the 68-95-99.7 rule, but I am confused at where to begin.
  2. jcsd
  3. Sep 27, 2007 #2
    Wrong section, sorry.
  4. Sep 27, 2007 #3


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    Can you state the the 68-95-99.7 rule?
  5. Sep 28, 2007 #4
    You have to standardize first, using Z=X-[tex]\mu[/tex][tex]/[/tex][tex]\sigma[/tex]
  6. Sep 28, 2007 #5


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    [itex](X-\mu)/\sigma[/itex] is what you must have meant.
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