#interpreting graphs

"Hello!~ I was wondering if you could show me how to do this?"

Certainly! The graph is showing how many students got each type of grade. Since all possible grades are shown, we can assume that all of the students in the class are represented in that graph. From reading the graph:

A - 6

B - 4

C - 12

D - 5

F - 1

Since these are all the kids in the class, add them up!

6 + 4 + 12 + 5 +1 = 10 + 12 + 6 = 28