# statistics

IQ scores are normally distributed with a mean u = 100 and a standard deviation o =15. Based on distribution, determine

% of IQ scores between 100 and 120 =

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1. mean = 100

Z = (score-mean)/SD

Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion between score and mean related to the Z score. Multiply by 100.

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2. the mean IQ in a certain sorority is 120 with SD of 5. What is the probability of selecting a random student whose IQ between 130 and 135?

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