SOLUTION: Ernie avergaed 90 on her quizzes during the first part of the quarter and 60 on her quizzes during the second partof the quarter. When she found out that her final average for the

Algebra ->  Probability-and-statistics -> SOLUTION: Ernie avergaed 90 on her quizzes during the first part of the quarter and 60 on her quizzes during the second partof the quarter. When she found out that her final average for the      Log On


   

Question 778902: Ernie avergaed 90 on her quizzes during the first part of the quarter and 60 on her quizzes during the second partof the quarter. When she found out that her final average for the quarter was not 75, she went to argue with her teacher. Give a possible explanation for Ernies misunderstanding.
A. the averages from each half were incorrect
B. The sum of the two averages must be divided by the total number of quizzes.
C. The average of the two averages does not take into account different number of quizzes taken in each half.
D. The final average is worth more than the average for each half.
Answer by psbhowmick(878) About Me  (Show Source):
You can put this solution on YOUR website!
D looks like a good option - weighted average.