The average score of the class is 17.33 and a standard deviation is 4.55. Assume the average letter grade of the class is C and the class grade follows a normal distribution. That is, 68% of students...

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Extracted text: The average score of the class is 17.33 and a standard deviation is 4.55. Assume the average letter grade of the class is C and the class grade follows a normal distribution. That is, 68% of students should get C, 13.5 % of the class get B, 2% of the class get A, and 0.5% of the class get A+. If your score is 27, which grade should you get? Assume Z stat for the probability occurrence at 99%, 95% and 90% are 2.75, 2.00, and 1.68 respectively and n-1. Confidence interval the mean + or- O A+ B.