1. About 100 000 students all over Region I took the National Achievement Test for Mathematics. If the test score is normally distributed, what proportion of the examinees will have a z-score between 1.5 and 2.5. 2. The scores on the National Achievement test for Physics given to a certain group of students in - Region IX are normally distributed with mean 80 and standard deviation 20. What should the score of a student be to place him or her among the top 5% of all students.

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