http://www.themodeshop.com/mean-median/
Mean Median
How do I solve this, median, and Mode mean trouble?
This is a problem. I would really appreciate if someone could help me take a whack in that regard. In particular exam, Tony corrected 10 papers and found the average for the group to be 70. Alice correcting the remaining 20 documents and found that the average for his group 80. What is the mean of the combined group of 30 students?
I agree that the answer is 76.66 because you can not add 70 + 80 and divided by two because There are two times more papers with an average of 80. You have to add 70 +80 +80 to give double weight to the average 80. When you add them together they total 230 divided by 3 is 76 2 / 3. 75 is the wrong answer.
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The Mean, Median & Mode