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.               27 If the range of scores for a C is  68 to 78   what fraction of students received a C?     a 0.4866           b 0.4679           c 0.4499           d 0.4226

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