Answer:
9 students failed
79 is the highest score
3 students got over 30 but less than 40
2 students scored 40
Explanation:
anything under 33 is failing and there are 9 leaves less than 33
7 is the largest stem and 9 is the largest leaf on that stem
there are only 3 leaves greater than 30 but under 40 they are 31, 31, and 39
the only same scores over passing are 40s