Question

How many students had a score of < 81 on the quiz

Answer 1

looking at the bar chart, there are 3 bars with scores less than 81

51-60 has 5 students
61-70 has 3 students
and 71-80 has 6 students
 
add them together: 5 + 3 + 6 = 14 total students less than 81

Answer 2

You would have to add 5+3+6=14 so you would have 14 students for your answer