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1.A.P. - 8. IQ Scores are normally distributed in the population. Who has higher IQ: a student with a 120 IQ on a scale where 100 is the mean and 10 is the standard deviation, or a professor with a 128 IQ on a scale where 100 is the mean and 15 is the standard deviation? Briefly explain your answer. 9. Use the z-cores and the corresponding percentiles shown at the top of the next column to solve this exercise. Test scores are normally distributed with a mean of 74 and a standard deviation of 10. What percentage of the scores are above 88? Z-scores Percentile 1.1 86.43 1.2 88.49 1.3 90.32 1.4 91.92 1.5 93.32 10. Using a random sample of 100 students from a campus of approximately 12000 students, 60% of the students in the sample said they were very satisfied with their professors. Find the margin of error in this percent. +-* 100%