An Instructor Decides to Weight the Scores on Three Tests

Short Answer

An instructor decides to weight the scores on three tests differently. The first test is weighted only half as much as the second test. The third test is the final and it is weighted twice as much as the second test. The mean grade on the first test was 68, the mean of the second test was 75, and the mean on the third test was 80. What is the mean grade for all three tests, assuming the same number of students took all the exams?