There are 12 sixth graders, 11 seventh graders, and 9 eighth graders in a gym class. The gym
teacher randomly selects one student to collect balls.
In how many ways can not choosing a seventh grader
occur?

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%)