Ann's grade is the average of four scores: Three chapter tests and a final that counts as two chapter tests. She scored 72, 90, and 75 on the chapter tests. What score does she need to have on the final to have a grade at least 80?
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Ann's grade is the average of four scores: Three chapter tests and a final that counts as two chapter tests. She scored 72, 90, and 75 on the chapter tests. What score does she need to have on the final to have a grade at least 80?
1) 80*5 = 400
2) 400 - ( 72+90+75) = 163
3) 163/2 = 82 rounded up.
The answer 82.
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