Indiana University posts the grade distributions for its courses online."' In one spring semester, students in Math 118 received 16.1% As, 34.3% B's, 29.2% Cs, 9.6% D's, and 9.8% F's. Using the common scale A = 4, B = 3, C = 2. D =1. F -0. take X to be the grade of a randomly chosen Math 118 student. find the mean and the standard deviation of grades in this section.

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