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ELEN [110]
3 years ago
12

The mean mark is 70% there are 30 students 20 of which are boys with a mean mark if 62% what is the mean for girls

Mathematics
1 answer:
Anna007 [38]3 years ago
7 0

Answer:

This problem can be solved by working backwards.  

Average of 30 students = 70.

Total marks of all the 30 students = 30x70 = 2100

Out of these 30, average of 20 students = 62

Total marks of these 30 students = 30x62 = 1860

So the total marks of the remaining 10 students = 2100-1860 = 240

Hence the average of the remaining 10 students = 240/10 = 24



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