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?
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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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Answer:
18×80 = 1440 , 12×90=1080 ,
1440+1080=2520
2520÷30 =84
84 is the mean marks of the entire class.
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