Two Sections of a Class Took the Same Quiz

Multiple Choice

Two sections of a class took the same quiz. Section A had 15 students who had a mean score of 80, and Section B had 20 students who had a mean score of 90. Overall, what was the approximate mean score for all of the students on the quiz?

A) 85.7
B) 85.0
C) It cannot be determined.
D) 84.3
E) none of these