The graph shows the distance of a remote control drone above the
ground as it flies west to east. The
X-axis represents the distance from a
central point and the y-axis represents
the distance above the ground, in m.

Astudent must have an average on five test that is greater than it equal to 80% but less than 90% to receive a final grade of b. devon's greades on the first four test were 78% 62% 91% and 80% what range if grades on the fifth test would give him a b in the course? ( assuming the highest grade is 100%)