Please help me solve this last problem guys than you so much

Which of the following circles have their centers in the third quadrant? check all that apply.

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%)

What is the interquartile range of this day at set?