1. A set of final examination grades in a course is normally distributed with a population mean of 75 and a population standard deviation of 10. What is probability of getting a grade of 90 or more on this exam? (4 points) (A) 0.9332 (B) 0.0668 (C) 0.0917 (D) 0.9083 2. 20% of the students taking the test scores higher than what grade? (4 points) (A) 79 (B) 83 (C) 89 (D) 92
