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___________? September 23, 2025 by Admin A. 45 B. 50 C. 51.4 approx. D. 54.6 approx. ✅ The correct answer is option C. 51.4 approx..
