On the first four exams, your grades are 82, 75, 80, and 90. There is still a final

Chapter 4, Problem 74

(choose chapter or problem)

On the first four exams, your grades are 82, 75, 80, and 90. There is still a final exam, and it counts as two grades. You are hoping to earn a B in the course: This will occur if the average of your six exam grades is greater than or equal to 80 and less than 90. What range of grades on the final exam will result in earning a B? Use interval notation to express this range.

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