The following table gives the mean scores for 4 different classes on the same test.
Class A Class B Class C Class D
72% 82% 63% 78%
What is the combined average for classes A, B, C and D, if
class A has 30 students, class B has 22 students, class C has
35 students, and class D has 27 students?
A
73.8%
73.5%
B
72.6%
D = 71.9%