SOLUTION: Markus scored 85, 92, 82, and 94 on the first four tests of the semester. His teacher has not yet told him his score on his fifth test, but did tell him that his score on the fifth

Algebra ->  Average -> SOLUTION: Markus scored 85, 92, 82, and 94 on the first four tests of the semester. His teacher has not yet told him his score on his fifth test, but did tell him that his score on the fifth      Log On


   



Question 1079754: Markus scored 85, 92, 82, and 94 on the first four tests of the semester. His teacher has not yet told him his score on his fifth test, but did tell him that his score on the fifth test is five points lower than the average (arithmetic mean) of all five tests. Which equation could Markus use to determine the score of the fifth test, x?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
So the average would be,
A=%2885%2B92%2B82%2B94%2BT%29%2F5
5A=353%2BT%0D%0ASo+then%2C%0D%0A%7B%7B%7BT=A-5
5T=5A-25
5T=353%2BT-25
4T=328
Solve for T.