Question:
The mean marks of 10 students in a class is 70. The students are divided into two groups of 6 and 4 respectively. If the mean marks of the first group is 60, what will be the mean marks of the second group
Answer:
Total mark of 10 students = 10*70 = 700
Total mark of first group = 6*60 =360
Total mark of second group = 700-360 =360
Mean marks of second group = 360/4 = 90
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