SOLUTION: Use Interval notation to express the range.. On the first of four exams, your grades are 78, 86, 69 and 79. You are hoping to earn a C in the course. this will occur if the aver

Question 378119: Use Interval notation to express the range..
On the first of four exams, your grades are 78, 86, 69 and 79. 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 a 70 and less than an 80. What range of grades on the fifth exam will result in earning a C?
Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!
Aim for the middle?
.
.
.
The average is equal to,

where X is the final grade.

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