A large group of students took a statistics test.               The mean score, from the scale of 100, was  74.5 with a standard deviation of  7.5   The test scores have a bell-shaped distribution.               28 If the minimum score for the letter grade B is 79   what fraction of students received a grade of B or higher. a 0.3082         b 0.2907         c 0.2743         d 0.2587

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