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posted by samantha on Wednesday, March 14, 2012 at 5:33pm.

assume that adults have IQ scores that are normally distributed with a mean of 100 and a standard deviation of 20. find the probability that a randomly selected adult has an IQ less than 20.

http://www.iqcomparisonsite.com/IQBasics.aspx

Z = (score-mean)/SD Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion related to the Z score.

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