The arithmetic mean of the scores of a group of students in a test was 52. The brightest 20% of them secured a mean score of 80 and the dullest 25% a mean score of 31. The mean score of remaining 55% is___________? December 31, 2021December 31, 2021 administrator A. 45B. 50C. 51.4 approx.D. 54.6 approx.Check AnswerC. 51.4 approx. Share the PostRelated Posts:The average mark of the students of a class in a…The average of 35 students in a class is 16 years.…The average age of 15 students of a class is 15…The average marks of a class of 30 students is 40…The mean marks of 30 students in a class is 58.5.…The average weight of a group of persons increased…