If 25% of a class averages 80% on a test, 50% of the class averages 65% on the test, and the remainder of the class averages 90% on the test, what is the overall class average?
Choose the correct choice from the following options:
A) 60%
B) 65%
C) 70%
D) 75%
E) 80%
This question is a Weighted Average question with a series of dependent variables.   The remaining portion of the class represents 100% - 25% - 50% = 25% of the class   Converting the portions of the class population to decimal weights, we find:   Class Average  100  - 25  - 50= 
<gadget id="calculator"> 100  - 25  - 50</gadget>
<output>25</output>
25% of the class   Converting the portions of the class population to decimal weights, we find:   Class Average= 0.25x80 + 0.50x65 + 0.25x90 = 75   The class average is 75%   Final Answer   75%) 75%
<result>D</result>
If 25% of a class averages 80% on a test, 50% of the class averages 65% on the test, and the remainder of the class averages 90% on the test, what is the overall class average?