Question: Teresa's five test grades for the semester are 89, 78, 69, and 77. Her final exam counts one-third of her final grade. What range of

Teresa's five test grades for the semester are 89, 78, 69, and 77. Her final exam counts one-third of her final grade. What range of grades on her final exam would result in Teresa receiving a final grade of a B in the course? For Teresa to obtain a B in the course, her average must be greater than or equal to 80 but less than 90.

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