Jacob is trying to determine if the after school tutoring program helps improve student test scores. She compares two classes test scores. None of the students in Class A participate in the programs. All students in Class B participate in the after school program. The test scores for each class is below. What is the difference in the median scores of the two classes?

Class A: 60,50,68,55,75,60,74,87,78,88,75,70,40

Class B: 71,83,66,68,67,70,74,92,83,95,91,78,88

1. 70
2. 8
3. 78
4. 148