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
(Broken Link Removed) I get 54.7%
Find the probability that a randomly selected person has an IQ score between 88 and
112.
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