if 30 % of a class averages 95 % on a test, 50 % of the class averages 79 % on the test, and the remainder of the class averages 60 % on the test, what is the overall class average? ( round final answer to the nearest percent ). Choose the correct choice: A) 76 % B) 77 % C) 78 % D) 79 % E) 80 %
<gadget id="calculator">30 * 95</gadget>
<output>2_850</output>

<gadget id="calculator">50 * 79</gadget>
<output>3_950</output>

<gadget id="calculator">2_850 + 3_950</gadget>
<output>6_800</output>

<gadget id="calculator">30 + 50</gadget>
<output>80</output>

<gadget id="calculator">100 - 80</gadget>
<output>20</output>

<gadget id="calculator">20 * 60</gadget>
<output>1_200</output>

<gadget id="calculator">6_800 + 1_200</gadget>
<output>8_000</output>

<gadget id="calculator">8_000 / 100</gadget>
<output>80</output>

<result>E</result>
if 30 % of a class averages 95 % on a test, 50 % of the class averages 79 % on the test, and the remainder of the class averages 60 % on the test, what is the overall class average? ( round final answer to the nearest percent ).
divide(add(add(multiply(30, 95), multiply(50, 79)), multiply(subtract(const_100, add(30, 50)), 60)), const_100)
"this question is a weighted average question with a series of dependent variables . the remaining portion of the class represents 100 % - 30 % - 50 % = 20 % of the class converting the portions of the class population to decimal weights , we find : class average = 0.30 x 95 + 0.50 x 79 + 0.20 x 60 = 80 the class average ( rounded ) is 80 % final answer e ) 80 %"