Bill is working out by running up and down steps at the local stadium. He runs a different number of steps in a random order.
Which of the following is his best time?
A) 25 steps in 5 minutes
B) 30 steps in 5.5 minutes
C) 20 steps in 4.5 minutes
D) 15 steps in 4 minutes

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%)