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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-
- A. 45
- B. 50
- C. 51.4 approx
- D. 54.6 approx
Answer: Option C
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