Answer:
11.
Step-by-step explanation:
The scores 60-69 has two people. The scores 70-79 have 9 people. Both are lower or below 80.
11
Add the number of people in the 60-69 range ( 2) and the number of people in the 70-79 range (9) to get the number of people below 80
2+9 = 11
