The arithmetic mean of the scores of a group of students in a test was 52. The b

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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-

Options:

A . 45

B . 50

C . 51.4 approx

D . 54.6 approx

Answer: Option C

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