The arithmetic mean of the scores of a group of students in a test was – McqOptions

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1.	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.	51.4
B.	53.6
C.	54.4
D.	55.6
Answer» B. 53.6

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