Ms. Blackwell gives an exam to two classes. The mean of the scores of the students in the morning class is 84, and the afternoon class's mean score is 70. The ratio of the number of students in the...

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Extracted text: Ms. Blackwell gives an exam to two classes. The mean of the scores of the students in the morning class is 84, and the afternoon class's mean score is 70. The ratio of the number of students in the morning class to the number of students in the 3 What is the mean of the scores of all the students? 4 afternoon class is (A) 74 (B) 75 (C) 76 (D) 77 (E) 78