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