SOLUTION: Mathematical Connections 10-4 p. 669# 3 3. On a certain exam, Tony corrected 10 papers and found the mean for his group to be 70. Alice corrected the remaining 20 papers and found

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Question 353944: Mathematical Connections 10-4 p. 669# 3
3. On a certain exam, Tony corrected 10 papers and found the mean for his group to be 70. Alice corrected the remaining 20 papers and found that the mean for her group was 80. What is the mean of the combined group of 30 students?
Answer by checkley77(12844) About Me  (Show Source):
You can put this solution on YOUR website!
[(10*70)+(20*80)]/30
[700+1600]/30
2,300/30=76.67 is the mean grade for the 30 students.