IQ scores are based on a normal model with a mean of 100 and standard deviation of 8. If a student has an IQ score of 115, what is their z-score? What is the probability that a person will have an IQ score higher than 115? What percent of population will have IQ scores between 115 and 120? If your IQ test results say you are at the 90th percentile, what is your IQ score? A person has a z-score of 0. What does this indicate their IQ is?

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