Solve the problem.
-On the first four exams, your grades are 76, 80, 71, and 77. You are hoping to earn a C in the course. This will occur if the average of your five exam grades is greater than or equal to 70 and less than 80. What range of
Grades on the fifth exam will result in earning a C?
A)[36, 86)
B)[46, 96)
C)(46, 96]
D)(36, 86]

Question

Quizplus · Accepted Answer

To find the range of grades on the fifth exam that will result in earning a C, calculate the average of the five exams. The sum of the first four grades is 304. Let x be the fifth grade. The average is (304 + x) / 5. For a C, 70 ≤ (304 + x) / 5 < 80. Solving these inequalities gives 46 ≤ x < 96.

Solve the Problem. -On the First Four Exams, Your Grades Are 76, 80