SOLUTION: Two high school classes took the same test. One class of 20 students made an average grade of 80%; the other class of 30 students made an average grade of 70%. What is the average

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Question 171498: Two high school classes took the same test. One class of 20 students made an average grade of 80%; the other class of 30 students made an average grade of 70%. What is the average grade for all students in both classes?
I got the answer of 75%. I'm not sure if that's correct.
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
Two high school classes took the same test. One class of 20 students made an average grade of 80%; the other class of 30 students made an average grade of 70%. What is the average grade for all students in both classes?
I got the answer of 75%. I'm not sure if that's correct.
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The weighted average is (20/50)*80 + (30/50)*70 = 74%
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Cheers,
Stan H.