Question 645535
<pre>
20% grades:  100, 99, 100, 100, 100, 100 

Find the average of your 20% grades {{{(100+99+100+100+100+100)/6}}} = {{{599/6}}} = 99.833333

80% grades:   39, 100 

Find the average of your 80% grades {{{(39+100)/2}}} = {{{139/2}}} = 69.5

Grade average for class = .20(20% average) + .80(80% average)

Grade average for class = .20(99.833333) + .80(69.5) = 75.166667.

Edwin</pre>