The arithmetic mean of the scores of a group of students in a test ofm

1.	The arithmetic mean of the scores of a group of students in a test ofmathematics was 48. The brightest 20% of them secured a mean score of75 and dullest 25% a mean score of 30. The mean score of the remaining55% is: *o 560/11O 56O 510/11O 670/11
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The arithmetic mean of the scores of a group of students in a test ofmathematics was 48. The brightest 20% of them secured a mean score of75 and dullest 25% a mean score of 30. The mean score of the remaining55% is: *o 560/11O 56O 510/11O 670/11

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The arithmetic mean of the scores of a group of students in a test ofmathematics was 48. The brightest 20% of them secured a mean score of75 and dullest 25% a mean score of 30. The mean score of the remaining55% is: *o 560/11O 56O 510/11O 670/11​

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The arithmetic mean of the scores of a group of students in a test ofmathematics was 48. The brightest 20% of them secured a mean score of75 and dullest 25% a mean score of 30. The mean score of the remaining55% is: *o 560/11O 56O 510/11O 670/11