The following are the average grade of 20 students: 1. What is the mean, variance and standard deviation? 2. What is the z-score of 89? 3. How many percent of students have a grade between 85 and 90? _____% 4. Show the areas of 85 and 90 in the normal curve. 5. What is the percentile rank of a student with a grade of 93?  6. What grade belongs to the 80th percentile?

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