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there are total 30 students in a class.On thursday,18 students took a math test and their mean marks was 80.The remaining 12 students took a math test on friday and their mean marks was 90.Find the mean marks of the entire class?

Answer»

ong>Answer:

(10)on thursday 18 students they who which write the test got 80 marks balance 12 students ATTEND the test on friday and the mark is 90 then 90-80 10



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