Mathematics
Medium
Question
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.
✓ Official correct answer
D
54.6 approx.
Community credibility
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A
45
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B
50
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C
51.4 approx.
No member explanations yet for this option.
D
54.6 approx.
No member explanations yet for this option.