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/courses/78209/quizzes/196830/take The test scores in a final examination are approximately normally distributed, with parameters u and s. The instructor assigns grades to the test scores

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/courses/78209/quizzes/196830/take The test scores in a final examination are approximately normally distributed, with parameters u and s. The instructor assigns grades to the test scores as shown in the following table (this is the process of "grading on the curve"). What fraction of the class gets each grade? Test score result Grade Xzu+2s 4.0 H+1.2s s X

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