Answer:
9 students
Step-by-step explanation:
You count all the students that completed less than 8 miles, so you count:
3 dots for 0 miles
2 dots for 2 miles
3 dots for 4 miles
1 dot for 6 miles
3 + 2 + 3 + 1 = 9 students
You don't count the 4 dots for 8 miles because they asked for students who did less than 8.