Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

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


    User Avatar
    Science Advisor
    Homework Helper

    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


    User Avatar
    Science Advisor
    Homework Helper

    [itex](X-\mu)/\sigma[/itex] is what you must have meant.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Similar Discussions: Statistics question
  1. Statistics Questions (Replies: 8)

  2. Statistics Question (Replies: 6)

  3. Statistics Question (Replies: 1)