Answer
About 55%.
Work Step by Step
The height of the point above the 500 represents the summation of the relative frequencies of all the first six classes: 200-249, 250-299, 300-349, 350-399, 400-449, 450-499. So, about 45% of students had a math score of 500 or below.
Now, the students who had a math score above 500 are those who did not have a math score of 500 or below. So:
$100$% $-45$% $=55$%
