the mean marks of a student in 5 subjects is 65.in this sixth subject, he got 20 marks more than this mean. find the mean marks of the students in all 6 subjects.
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mean marks of a student in 5 subjects is 65.
Total marks of a student in 5 subjects is 65.×5 =325
⇒in this sixth subject, he got 20 marks more than this mean
⇒in this sixth subject, he got 20 +65marks =85
Total marks of a student in 6 subjects is 85.+325=410 marks
mean marks of a student in 6 subjects is 410÷6= 68.3 ans
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