If 45% of a class averages 100% on a test, 50% of the class averages 78% on the test, and the remainder of the class averages 65% on the test, what is the overall class average? (Round final answer to the nearest percent).
Choose the correct answer.
A) 86%
B) 87%
C) 88%
D) 89%
E) 90%
This question is a Weighted Average question with a series of dependent variables.   The remaining portion of the class represents 100% - 45% - 50% = 5% of the class   Converting the portions of the class population to decimal weights, we find:   Class Average  100  - 45  - 50= 
<gadget id="calculator"> 100  - 45  - 50</gadget>
<output>5</output>
5% of the class   Converting the portions of the class population to decimal weights, we find:   Class Average= 0.45x100 + 0.50x78 + 0.05x63 = 87.15   The class average (rounded) is 87%   Final Answer   87%) 87%
<result>B</result>
If 45% of a class averages 100% on a test, 50% of the class averages 78% on the test, and the remainder of the class averages 65% on the test, what is the overall class average? (Round final answer to the nearest percent).