Statistics question

  • Thread starter alandry06
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  • #1
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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.
 

Answers and Replies

  • #2
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Wrong section, sorry.
 
  • #3
EnumaElish
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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.
Can you state the the 68-95-99.7 rule?
 
  • #4
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You have to standardize first, using Z=X-[tex]\mu[/tex][tex]/[/tex][tex]\sigma[/tex]
 
  • #5
EnumaElish
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You have to standardize first, using Z =
[itex](X-\mu)/\sigma[/itex] is what you must have meant.
 

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