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Researchers have studied the IQ scores of a sample of adults from a population. The distribution of IQ scores is normally distributed with a mean of 100 and standard deviation of 15. What is the percentage of IQ scores below 120? What percentage of IQ scores are between 100 and 120? What percentage of IQ scores are above 85? What IQ score divides the lowest 20% of scores from the highest 80%? What percentage of IQ scores fall between 90 and 110, and between 90 and 130?

Explore normal distribution of IQ scores with a mean of 100 and standard deviation of 15. Learn how to calculate percentages of scores below 120, between 100 and 120, and above 85. Also, determine the score dividing the lowest 20% from the highest 80%, and find percentages for IQ ranges 90-110 and 90-130. Suitable for high school and college-level statistics.

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