SOLUTION: In a certain course, Amy received an average (arithmetic mean) score of 84 for her first 2 tets, 78 for her third test, and 94 for her fourth test. What grade must she receive on h
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Question 463421: In a certain course, Amy received an average (arithmetic mean) score of 84 for her first 2 tets, 78 for her third test, and 94 for her fourth test. What grade must she receive on her next test if she wants an average of 87 for all 5 tests?
Answer by alicealc(293) (Show Source): You can put this solution on YOUR website!
(84 * 2 + 78 + 94 + x)/5 = 87
168 + 78 + 94 + x = 87 * 5
340 + x = 435
x = 435 - 340 = 95
so, she must receive 95 for the next test
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