Q 2224545451.     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:

IBPS-PO 2017 Mock Prelims
A

`45`

B

`50`

C

`52.4`

D

`54.6`

E

None of these

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