Grades on a final exam in Economics are normally distributed with a mean of 71 and a standard deviation of 11.
A. What is the probability that a randomly selected student will receive a score greater than 80?
B. What is the probability that a randomly selected student will score less than 60 and fail the exam?
C. If the top 10% of scores receive a grade of "A", what is the minimum score needed to get an "A"?