3. In order to know the cutoff exam scores required for Curved Grading Option #1, Dr. Groppe needs to know what z-scores correspond to the upper limit percentiles. Find each z-score that corresponds to the following percentiles by using the cumulative normal distribution tables. Use the z-score with the percentage closest to the percentile. Round your z-scores to 2 decimal places. We've found the z-score of the 90th percentile for you. 90th percentile 1.28 80th percentile 70th percentile 60th percentile

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