Graph Totals and Differences Practice Test

A scatter plot shows the relationship between hours studied and test scores for 30 students. The data reveals that 8 students studied 0-2 hours and scored an average of 65 points, 12 students studied 3-5 hours and scored an average of 78 points, and 10 students studied 6+ hours and scored an average of 89 points. If we calculate the total points earned by all students in each study group, how many more total points did the 3-5 hour group earn compared to the 0-2 hour group?

A histogram displays test scores for two classes. Class A had 8 students score between 90-100, 12 students score between 80-89, 15 students score between 70-79, and 5 students score below 70. Class B had 11 students score between 90-100, 9 students score between 80-89, 18 students score between 70-79, and 2 students score below 70. What is the total number of students who scored 80 or above across both classes combined?