there are 80 students in class XI the average marks in statistics are – InterviewSolution

1.	there are 80 students in class XI the average marks in statistics are 65 for the class there are 50 students in first section whose average marks are 60. find average marks of second section.
Answer» TION:AnswerTotal number of students in section A and B = 25 + 20 = 45Average SCORE of both the sections = 28∴ Total score of both the sections = 28 X 45 = 1260Total score of section A = 25 x 30 = 750Let the average score of section B = xThen, total score of section B = 20xGiven, 20x + 750 = 1260⇒20x=510⇒x=25.5

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