The arithmetic mean of the scores of a group of students in a test was 52. The brightest 20% of them secured a mean

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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

#### HINT

(Provided By a Student and Checked/Corrected by EXXAMM.com Team)

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