Question

For 14-17, the scores listed are from the same course as in 10-13. The three test scores are given. What score do they need on their Final exam which is worth twice as much (100 being the highest possible) to earn an 80 in the class? (a Backwards question)

14. Tests: 76, 81, 72.

15. Tests: 60, 65, 70.

16. Tests: 50, 70, 70.

17. Tests: 60, 70, 75.

Answer 1

Answer: To earn an 80 in the class, the student needs to get a score of 80*2=160 on their final exam.

14. Tests: 76, 81, 72. Final exam: 160-((76+81+72)/3)2 =160-772 =160-154=6

Tests: 60, 65, 70. Final exam: 160-((60+65+70)/3)2 =160-652 =160-130=30

Tests: 50, 70, 70. Final exam: 160-((50+70+70)/3)2 =160-632 =160-126=34

Tests: 60, 70, 75. Final exam: 160-((60+70+75)/3)2 =160-682 =160-136=24

Explanation: