A group of 14 and 15-year-olds were polled on their
favorite season. The results are shown in the frequency
table.
14 yr
15 yr
Total
Summer
23
45
Spring
Fall
14
Winter
123
15
Total
47
35

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%)