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Maths Mcqs

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.Correct Answer
D. 54.6 approx.
Correct Option: C. 51.4 approx.

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