2. Mrs. Marson's Data Management class wrote a test with the results being normally distributed. The grades have a mean of 75% and a standard deviation of 8.2. a) Christine obtained an 85% on her test. What percent of the class got a grade below hers? (2 marks) b) What percent of students achieved a mark greater than 90%? (3 marks) c) What percent of students achieved a mark between 70% and 90%