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The arithmetic mean of the scores of a g...

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)

Text Solution

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The correct Answer is:
C
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