1.

The mean of the marks obtained by 250 students in mathematics was 50. The mean marks of the top 50 students and the last 100 students were 75 and 25 respectively. Then the mean mark of the remaining 100 students is

Answer» The mean of the marks obtained by 250 students in mathematics was 50. The mean marks of the top 50 students and the last 100 students were 75 and 25 respectively. Then the mean mark of the remaining 100 students is


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