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:
590,000
625,000
6% off
1,499
2,499
40% off
590,000
625,000
6% off
3,999
5,499
27% off
590,000
0.0
5.0
5.0
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