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# IV. Normal Distribution 9. IQ scores are said to be normally distributed with a mean of 100 and a standard deviation of 15. Label

## IV. Normal Distribution 9. IQ scores are said to be normally distributed with a mean of 100 and a standard deviation of 15. Label the normal curve below and then answer the questions that follow. a. What percent of the population have an IQ higher than 115? b. What is the IQ score for the middle 68% of the population? c. What is the probability that a person will have an IQ less than 55? d. What is the IQ score for the upper 2.5% of the population? e. What percent of the population have an IQ score over 85?

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