The Drama Club is showing a video of their recent play. The first showing begins at 4:35 p. m. The second showing is scheduled at 7:15 p. m. with a 1
2
−hour break between the showings.

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%)