12. The mean marks of the students of combined sections A and B are 38. There are 60 and 40 students in sections A and B respectively. If mean marks of the students in section A are 40, calculate the mean marks of students in section B.
13. 60 students of section A of class XI of statistics, obtained 40 marks on an average and 40 students of section B obtained 35 as the mean marks in statistics. Find out mean marks in statistics as a whole.
14. In a class of 50 students 10 have failed and their average marks is 2.5. The total marks secured by the entire class was 281. Find out the average marks of those who have passed.
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