A teacher informs her psyhcology class (of 500+ students) that a test was very difficult, but the grades would be curved. Scores on the test were normally distributed with a mean of 45 and a standard...

Extracted text: A teacher informs her psyhcology class (of 500+ students) that a test was very difficult, but the grades would be curved. Scores on the test were normally distributed with a mean of 45 and a standard deviation of 6.9. The maximum possible score on the test was 100 points. Because of partial credit, scores were recorded with 1 decimal point accuracy. (Thus, a student could earn a 45.2, but not a 44.43.) The grades are curved according to the following scheme. Find the numerical limits for each letter grade. Letter Scheme Interval A. Top 8% Scores above the bottom 71% and below the top 8% Scores above the bottom 29% and below the top 29% Scores above the bottom 8% and below the top 71% F Bottom 8%