SOLUTION: Johns overall quiz average for 8 quizzes is 89.25. At the midterm of the quarter his average on the first 5 quizzes was 88.2. His parents made an agreement with John that if his av

Algebra ->  Average -> SOLUTION: Johns overall quiz average for 8 quizzes is 89.25. At the midterm of the quarter his average on the first 5 quizzes was 88.2. His parents made an agreement with John that if his av      Log On


   

Question 663474: Johns overall quiz average for 8 quizzes is 89.25. At the midterm of the quarter his average on the first 5 quizzes was 88.2. His parents made an agreement with John that if his average on the last three quizzes was 90 or better they would buy him a new iPod. Based on the information should johns parent but him the iPod? Show your work and explain how you arrived at your answer
Answer by jerryguo41(197) About Me  (Show Source):
You can put this solution on YOUR website!
Quiz average is calculated by adding all quizzes and dividing by the number of quizzes.
Thus
8%2A89.25=714 gives the total number of percentage points obtained on the eight quizzes.
5%2A88.2=441 gives the average on the fist five which means
714-441=273 is the total percentage points on of the last three quizzes
Finally the average is the total points divided by the number of quizzes(3).
273%2F3=91
John should get his iPod from his parents