IQ-scores-are-standardized-such-that-the-population-of-scores-has-a-mean-of-100-and-a-variance-of-225-

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–IQ scores are standardized such that the population of scores has a mean of 100 and a variance of 225. Assuming IQ scores have a normal distribution, what proportion of scores will fall below 65? –What values occur in the top and bottom 9% of the distribution?

 
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