Posted by Mya on Sunday, November 22, 2009 at 9:50am.
The "sigma" or standard deviation for IQ sorces is 16, and the mean is 100. You are asking for the probability that the IQ is between -0.75 sigma and +0.75 sigma of the mean of a normal distribution.
Using the computational tool at
http://psych.colorado.edu/~mcclella/java/normal/accurateNormal.html, I get 54.7%
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