Which pair of points should be used to find the line of best-fit for the scatterplot?. On a graph, a trend line would go through points K and M. J and L J and M K and L K and M

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%)