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The arithmetic mean of the scores of ...

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.

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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) 4550quad (c) 51.4 approx.(d)54.6 approx.

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