Problem:
One hundred students at Century High School participated in the last year, and their mean score was . The number of non-seniors taking the was more than the number of seniors, and the mean score of the seniors was higher than that of the non-seniors. What was the mean score of the seniors?
Answer Choices:
A.
B.
C.
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E.
Solution:
If seniors took the then non-seniors took it, so and . If is the mean score for the seniors then is the mean score for the non-seniors, so and .