An English professorassigns letter grades on a test according to the followingscheme.
A: Top 9% ofscores
B: Scores below thetop 9% and above the bottom 63%
C: Scores below thetop 37% and above the bottom 22%
D: Scores below thetop 78% and above the bottom 6%
F: Bottom 6% ofscores
Scores on the test arenormally distributed with a mean of 66.9 and a standard deviationof 9.2. Find the numerical limits for a D grade. Round your answersto the nearest whole number, if necessary.
Answer
2 Points
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numerical limit 1 and numerical limit 2
